diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index a05b0e17..2326b54c 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -4,16 +4,6 @@
 
 Cockatrice is written in C++-03, so do not use C++11 constructs such as `auto`.
 
-Cockatrice support both Qt 4 and Qt 5, so make sure that your code compiles
-with both. If there have been breaking changes between Qt 4 and 5, use a
-statement such as
-
-    #if QT_VERSION >= 0x500000
-        doSomethingWithQt5();
-    #else
-        doSomethingWithQt4();
-    #endif
-
 For consistency, use Qt data structures where possible, such as `QString` over
 `std::string` or `QList` over `std::vector`.
 
diff --git a/.travis.yml b/.travis.yml
index b8a00074..0f5536b5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,26 +2,20 @@ language: cpp
 matrix:
   fast_finish: true
   include:
-    # linux precise debug build, precise + gcc + qt4
-    - os: linux
-      env: QT4=1 BUILDTYPE=Debug DIST=precise
     # linux debug build, trusty + gcc + qt5
     - os: linux
       dist: trusty
-      env: QT4=0 BUILDTYPE=Debug DIST=trusty
+      env: BUILDTYPE=Debug DIST=trusty
     # osx debug build, osx + clang + qt5
     - os: osx
-      env: QT4=0 BUILDTYPE=Debug
-    # linux precise release build, precise + gcc + qt4
-    - os: linux
-      env: QT4=1 BUILDTYPE=Release DIST=precise
+      env: BUILDTYPE=Debug
     # linux trusty release build, precise + gcc + qt5
     - os: linux
       dist: trusty
-      env: QT4=0 BUILDTYPE=Release DIST=trusty
+      env: BUILDTYPE=Release DIST=trusty
     # osx release build, osx + gcc + qt5
     - os: osx
-      env: QT4=0 BUILDTYPE=Release
+      env: BUILDTYPE=Release
 script: ./travis-compile.sh
 install: ./travis-dependencies.sh
 cache: apt
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 894bcb8a..416bedd7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -110,17 +110,11 @@ IF(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
     ADD_DEFINITIONS("-DSFMT_MEXP=19937")
 ENDIF()
 
-# Find Qt and enable the needed features
-# Default is Qt5 unless WITH_QT4 option is enabled
-option(WITH_QT4 "Force the use of Qt4 libraries" OFF)
+# Find Qt5
 OPTION(UPDATE_TRANSLATIONS "Update translations on compile" OFF)
 MESSAGE(STATUS "UPDATE TRANSLATIONS: ${UPDATE_TRANSLATIONS}")
 
-IF(NOT WITH_QT4)
-    # First known not-broken Qt5 version (5.0.2 available on old ubuntus is buggy).
-    FIND_PACKAGE(Qt5Widgets 5.0.3)
-ENDIF()
-
+FIND_PACKAGE(Qt5Widgets 5.0.3 REQUIRED)
 IF(Qt5Widgets_FOUND)
     MESSAGE(STATUS "Found Qt ${Qt5Widgets_VERSION_STRING}")
 
@@ -141,27 +135,7 @@ IF(Qt5Widgets_FOUND)
     ENDIF()
 
 ELSE()
-    FIND_PACKAGE(Qt4 4.8.0 REQUIRED)
-    IF(QT4_FOUND)
-        # Old FindQt4.cmake modules used the same flag with different case
-        SET(Qt4_FOUND TRUE)
-    ENDIF()
-    IF(Qt4_FOUND)
-        MESSAGE(STATUS "Found Qt ${QT_VERSION_MAJOR}.${QT_VERSION_MINOR}.${QT_VERSION_PATCH}")
-
-        IF(UPDATE_TRANSLATIONS)
-            IF(NOT QT_LUPDATE_EXECUTABLE)
-                MESSAGE(WARNING "Qt's lupdate not found.")
-            ENDIF()
-        ENDIF()
-
-        IF(NOT QT_LRELEASE_EXECUTABLE)
-            MESSAGE(WARNING "Qt's lrelease not found.")
-        ENDIF()
-
-    ELSE()
-        MESSAGE(FATAL_ERROR "No Qt4 or Qt5 found!")
-    ENDIF()
+    MESSAGE(FATAL_ERROR "No Qt5 found!")
 ENDIF()
 
 set(CMAKE_AUTOMOC TRUE)
@@ -200,9 +174,7 @@ if(UNIX)
     	set(CPACK_DEBIAN_PACKAGE_SHLIBDEPS ON)
     	set(CPACK_DEBIAN_PACKAGE_SECTION "games")
     	set(CPACK_DEBIAN_PACKAGE_HOMEPAGE "http://github.com/Cockatrice/Cockatrice")
-        IF(Qt5Widgets_FOUND)
-            set(CPACK_DEBIAN_PACKAGE_DEPENDS "libqt5multimedia5-plugins, libqt5svg5")
-        ENDIF()
+        set(CPACK_DEBIAN_PACKAGE_DEPENDS "libqt5multimedia5-plugins, libqt5svg5")
     endif()
 elseif(WIN32)
     set(CPACK_GENERATOR NSIS ${CPACK_GENERATOR})
diff --git a/Dockerfile b/Dockerfile
index ad0352b0..d0af357a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -27,7 +27,7 @@ COPY servatrice/ servatrice/
 COPY README.md README.md
 
 WORKDIR build
-RUN cmake .. -DWITH_QT4=0 -DWITH_SERVER=1 -DWITH_CLIENT=0 -DWITH_ORACLE=0 &&\
+RUN cmake .. -DWITH_SERVER=1 -DWITH_CLIENT=0 -DWITH_ORACLE=0 &&\
   make &&\
   make install
 
diff --git a/README.md b/README.md
index 4c9e3355..9a8ff92e 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@
 
 # Cockatrice
 
-Cockatrice is an open-source multiplatform supported program for playing tabletop card games over a network. The program's server design prevents any kind of client modifications to gain an unfair advantage in a game. The client also has a built in single-player mode where you can brew without being connected to a server. This project is written in C++/Qt with support for both Qt4 and Qt5.<br>
+Cockatrice is an open-source multiplatform supported program for playing tabletop card games over a network. The program's server design prevents any kind of client modifications to gain an unfair advantage in a game. The client also has a built in single-player mode where you can brew without being connected to a server. This project is written in C++ and is using the Qt5 libraries.<br>
 
 
 # Downloads
@@ -60,10 +60,6 @@ Dependencies:
 Oracle can optionally use zlib to load zipped files:
 - [zlib](http://www.zlib.net/) (no https!)
 
-The server requires an additional dependency when compiled under Qt4:
-- [libgcrypt](https://www.gnu.org/software/libgcrypt/)
-
-
 To compile:
 
     mkdir build
@@ -87,7 +83,6 @@ The following flags can be passed to `cmake`:
 - `-DWITH_CLIENT=0` Whether to build the client (default 1 = yes).
 - `-DWITH_ORACLE=0` Whether to build oracle (default 1 = yes).
 - `-DPORTABLE=1` Build portable versions of client & oracle (default 0 = no).
-- `-DWITH_QT4=1` Force compilation to use Qt4 instead of Qt5 (default 0 = no).
 - `-DCMAKE_BUILD_TYPE=Debug` Compile in debug mode. Enables extra logging output, debug symbols, and much more verbose compiler warnings (default `Release`).
 - `-DUPDATE_TRANSLATIONS=1` Configure `make` to update the translation .ts files for new strings in the source code. Note: Running `make clean` will remove the .ts files (default 0 = no).
 - `-DTEST=1` Enable regression tests (default 0 = no). Note: needs googletest, will be downloaded on the fly if unavailable. To run tests: ```make test```.
diff --git a/cmake/FindLibgcrypt.cmake b/cmake/FindLibgcrypt.cmake
deleted file mode 100644
index 880a5d69..00000000
--- a/cmake/FindLibgcrypt.cmake
+++ /dev/null
@@ -1,46 +0,0 @@
-# -*- cmake -*-
-
-# Copied from http://code.google.com/p/emeraldviewer/
-
-# - Find libgcrypt
-# Find the libgcrypt includes and library
-# This module defines
-#  LIBGCRYPT_INCLUDE_DIR, where to find gcrypt.h, etc.
-#  LIBGCRYPT_LIBRARIES, the libraries needed to use libgcrypt.
-#  LIBGCRYPT_FOUND, If false, do not try to use libgcrypt.
-# also defined, but not for general use are
-#  LIBGCRYPT_LIBRARY, where to find the libgcrypt library.
-
-FIND_PATH(LIBGCRYPT_INCLUDE_DIR gcrypt.h)
-
-SET(LIBGCRYPT_NAMES ${LIBGCRYPT_NAMES} gcrypt)
-FIND_LIBRARY(LIBGCRYPT_LIBRARY
-  NAMES ${LIBGCRYPT_NAMES}
-  )
-
-IF (LIBGCRYPT_LIBRARY AND LIBGCRYPT_INCLUDE_DIR)
-    SET(LIBGCRYPT_LIBRARIES ${LIBGCRYPT_LIBRARY})
-    SET(LIBGCRYPT_FOUND "YES")
-ELSE (LIBGCRYPT_LIBRARY AND LIBGCRYPT_INCLUDE_DIR)
-  SET(LIBGCRYPT_FOUND "NO")
-ENDIF (LIBGCRYPT_LIBRARY AND LIBGCRYPT_INCLUDE_DIR)
-
-
-IF (LIBGCRYPT_FOUND)
-   IF (NOT LIBGCRYPT_FIND_QUIETLY)
-      MESSAGE(STATUS "Found libgcrypt: '${LIBGCRYPT_LIBRARIES}' and header in '${LIBGCRYPT_INCLUDE_DIR}'")
-   ENDIF (NOT LIBGCRYPT_FIND_QUIETLY)
-ELSE (LIBGCRYPT_FOUND)
-   IF (LIBGCRYPT_FIND_REQUIRED)
-      MESSAGE(FATAL_ERROR "Could not find libgcrypt library")
-   ENDIF (LIBGCRYPT_FIND_REQUIRED)
-ENDIF (LIBGCRYPT_FOUND)
-
-# Deprecated declarations.
-SET (NATIVE_LIBGCRYPT_INCLUDE_PATH ${LIBGCRYPT_INCLUDE_DIR} )
-GET_FILENAME_COMPONENT (NATIVE_LIBGCRYPT_LIB_PATH ${LIBGCRYPT_LIBRARY} PATH)
-
-MARK_AS_ADVANCED(
-  LIBGCRYPT_LIBRARY
-  LIBGCRYPT_INCLUDE_DIR
-  )
diff --git a/cmake/FindQtMobility.cmake b/cmake/FindQtMobility.cmake
deleted file mode 100644
index 8e7edf5e..00000000
--- a/cmake/FindQtMobility.cmake
+++ /dev/null
@@ -1,158 +0,0 @@
-INCLUDE(FindQt4)
-
-set(MOBILITY_CONFIG_MKSPECS_FILE "")
-IF(EXISTS "${QT_MKSPECS_DIR}/features/mobilityconfig.prf")
-    set(MOBILITY_CONFIG_MKSPECS_FILE "${QT_MKSPECS_DIR}/features/mobilityconfig.prf")
-ELSEIF(EXISTS "${QT_MKSPECS_DIR}/features/mobility.prf")
-    set(MOBILITY_CONFIG_MKSPECS_FILE "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules/mobilityconfig.prf")
-ENDIF()
-
-macro(export_component component)
-    IF(NOT ${MOBILITY_CONFIG_MKSPECS_FILE} STREQUAL "")
-        FILE(READ ${MOBILITY_CONFIG_MKSPECS_FILE} MOBILITY_FILE_CONTENTS)
-        STRING(TOLOWER ${component} _COMPONENT)
-        IF(${MOBILITY_FILE_CONTENTS} MATCHES "MOBILITY_CONFIG=.*${_COMPONENT}.*")
-            STRING(TOUPPER ${component} _COMPONENT)
-            SET(QT_MOBILITY_${_COMPONENT}_FOUND 1)
-            SET(QT_MOBILITY_${_COMPONENT}_INCLUDE_DIR ${QT_MOBILITY_PARENT_INCLUDE_DIR}/Qt${component})
-            SET(QT_MOBILITY_${_COMPONENT}_LIBRARY Qt${component})
-        ENDIF()
-    ENDIF()
-endmacro()
-
-set(VERSION_INFO "")
-set(FEATURE_FILE_PREFIX "${QT_MKSPECS_DIR}/features/mobility")
-
-if(DEFINED MOBILITY_VERSION)
-    if(MOBILITY_VERSION STREQUAL "1.1" AND EXISTS "${FEATURE_FILE_PREFIX}11.prf")
-        set(MOBILITY_PRF_FILE "${FEATURE_FILE_PREFIX}11.prf")
-        set(VERSION_INFO "1.1")
-    elseif(MOBILITY_VERSION STREQUAL "1.2" AND EXISTS "${FEATURE_FILE_PREFIX}12.prf")
-        set(MOBILITY_PRF_FILE "${FEATURE_FILE_PREFIX}12.prf")
-        set(VERSION_INFO "1.2")
-    elseif(MOBILITY_VERSION STREQUAL "default" AND EXISTS "${FEATURE_FILE_PREFIX}.prf")
-        set(MOBILITY_PRF_FILE "${FEATURE_FILE_PREFIX}.prf")
-        set(VERSION_INFO "system's default")
-    else()
-        message(STATUS "Couldn't find QtMobility version: ${MOBILITY_VERSION}")
-    endif()
-endif()
-
-if(NOT DEFINED MOBILITY_PRF_FILE)
-    if(EXISTS "${FEATURE_FILE_PREFIX}.prf")
-        set(MOBILITY_PRF_FILE "${FEATURE_FILE_PREFIX}.prf")
-        set(VERSION_INFO "system's default")
-    elseif(EXISTS "${FEATURE_FILE_PREFIX}12.prf")
-        set(MOBILITY_PRF_FILE "${FEATURE_FILE_PREFIX}12.prf")
-        set(VERSION_INFO "1.2")
-    elseif(EXISTS "${FEATURE_FILE_PREFIX}11.prf")
-        set(MOBILITY_PRF_FILE "${FEATURE_FILE_PREFIX}11.prf")
-        set(VERSION_INFO "1.1")
-    else()
-        message(FATAL_ERROR "Couldn't find any version of QtMobility.")
-    endif()
-endif()
-
-message(STATUS "Using QtMobility version: ${VERSION_INFO}")
-
-IF(DEFINED MOBILITY_PRF_FILE)
-    FILE(READ ${MOBILITY_PRF_FILE} MOBILITY_FILE_CONTENTS)
-
-    STRING(REGEX MATCH "MOBILITY_PREFIX=([^\n]+)" QT_MOBILITY_PREFIX "${MOBILITY_FILE_CONTENTS}")
-    SET(QT_MOBILITY_PREFIX ${CMAKE_MATCH_1})
-
-    STRING(REGEX MATCH "MOBILITY_INCLUDE=([^\n]+)" QT_MOBILITY_INCLUDE_DIR "${MOBILITY_FILE_CONTENTS}")
-    SET(QT_MOBILITY_INCLUDE_DIR ${CMAKE_MATCH_1})
-
-    STRING(REGEX MATCH "MOBILITY_LIB=([^\n]+)" "\\1" QT_MOBILITY_LIBRARY "${MOBILITY_FILE_CONTENTS}")
-    SET(QT_MOBILITY_LIBRARY_DIR ${CMAKE_MATCH_1})
-
-    #VERSION
-    IF(NOT ${MOBILITY_CONFIG_MKSPECS_FILE} STREQUAL "")
-        FILE(READ ${MOBILITY_CONFIG_MKSPECS_FILE} MOBILITY_CONFIG_FILE_CONTENTS)
-        STRING(REGEX MATCH "MOBILITY_VERSION = ([^\n]+)" QT_MOBILITY_VERSION "${MOBILITY_CONFIG_FILE_CONTENTS}")
-        SET(QT_MOBILITY_VERSION ${CMAKE_MATCH_1})
-
-        STRING(REGEX MATCH "MOBILITY_MAJOR_VERSION = ([^\n]+)" QT_MOBILITY_MAJOR_VERSION "${MOBILITY_CONFIG_FILE_CONTENTS}")
-        SET(QT_MOBILITY_MAJOR_VERSION ${CMAKE_MATCH_1})
-
-        STRING(REGEX MATCH "MOBILITY_MINOR_VERSION = ([^\n]+)" QT_MOBILITY_MINOR_VERSION "${MOBILITY_CONFIG_FILE_CONTENTS}")
-        SET(QT_MOBILITY_MINOR_VERSION ${CMAKE_MATCH_1})
-
-        STRING(REGEX MATCH "MOBILITY_PATCH_VERSION = ([^\n]+)" QT_MOBILITY_PATCH_VERSION "${MOBILITY_CONFIG_FILE_CONTENTS}")
-        SET(QT_MOBILITY_PATCH_VERSION ${CMAKE_MATCH_1})
-    ELSE()
-        SET(QT_MOBILITY_VERSION 1.0.0)
-        SET(QT_MOBILITY_MAJOR_VERSION 1)
-        SET(QT_MOBILITY_MINOR_VERSION 0)
-        SET(QT_MOBILITY_PATCH_VERSION 0)
-    ENDIF()
-
-    SET(QT_MOBILITY_PARENT_INCLUDE_DIR ${QT_MOBILITY_INCLUDE_DIR})
-    SET(QT_MOBILITY_INCLUDE_DIR ${QT_MOBILITY_INCLUDE_DIR}/QtMobility)
-
-    IF(QtMobility_FIND_VERSION_EXACT)
-        IF(QT_MOBILITY_VERSION VERSION_EQUAL QtMobility_FIND_VERSION)
-            SET(QT_MOBILITY_FOUND TRUE)
-        ELSE()
-            SET(QT_MOBILITY_FOUND FALSE)
-            IF(QT_MOBILITY_VERSION VERSION_LESS QtMobility_FIND_VERSION)
-                SET(QT_MOBILITY_TOO_OLD TRUE)
-            ELSE()
-                SET(QT_MOBILITY_TOO_NEW TRUE)
-            ENDIF()
-        ENDIF()
-    ELSE()
-        IF(QT_MOBILITY_VERSION VERSION_LESS QtMobility_FIND_VERSION)
-            SET(QT_MOBILITY_FOUND FALSE)
-            SET(QT_MOBILITY_TOO_OLD TRUE)
-        ELSE()
-            SET(QT_MOBILITY_FOUND TRUE)
-        ENDIF()
-    ENDIF()
-ELSE()
-    SET(QT_MOBILITY_FOUND NOTFOUND)
-    SET(QT_MOBILITY_PREFIX NOTFOUND)
-    SET(QT_MOBILITY_INCLUDE NOTFOUND)
-    SET(QT_MOBILITY_LIB NOTFOUND)
-ENDIF()
-
-IF(NOT QT_MOBILITY_FOUND)
-    if(QT_MOBILITY_TOO_OLD)
-        MESSAGE(FATAL_ERROR "The installed QtMobility version ${QT_MOBILITY_VERSION} it too old, version ${QtMobility_FIND_VERSION} is required.")
-    ELSEIF(QT_MOBILITY_TOO_NEW)
-        MESSAGE(FATAL_ERROR "The installed QtMobility version ${QT_MOBILITY_VERSION} it too new, version ${QtMobility_FIND_VERSION} is required.")
-    ELSE()
-        MESSAGE(FATAL_ERROR "QtMobility not found.")
-    ENDIF()
-ELSE()
-    export_component(Bearer)
-    export_component(Feedback)
-    export_component(Gallery)
-    export_component(PublishSubscribe)
-    export_component(Location)
-    export_component(Organizer)
-    export_component(ServiceFramework)
-    export_component(SystemInfo)
-    export_component(Contacts)
-    export_component(Messaging)
-    export_component(Versit)
-    export_component(Sensors)
-    # VersitOrganizer
-    if(${QT_MOBILITY_CONTACTS_FOUND} AND ${QT_MOBILITY_VERSIT_FOUND})
-        SET(QT_MOBILITY_VERSITORGANIZER_FOUND 1)
-        SET(QT_MOBILITY_VERSITORGANIZER_INCLUDE_DIR ${QT_MOBILITY_PARENT_INCLUDE_DIR}/QtVersitOrganizer)
-        SET(QT_MOBILITY_VERSITORGANIZER_LIBRARY QtVersitOrganizer)
-    endif()
-
-    # MultimediaKit - it's just 'multimedia' in the .prf file.
-    IF(NOT ${MOBILITY_CONFIG_MKSPECS_FILE} STREQUAL "")
-        FILE(READ ${MOBILITY_CONFIG_MKSPECS_FILE} MOBILITY_FILE_CONTENTS)
-        IF(${MOBILITY_FILE_CONTENTS} MATCHES "MOBILITY_CONFIG=.*multimedia.*")
-            SET(QT_MOBILITY_MULTIMEDIAKIT_FOUND 1)
-            SET(QT_MOBILITY_MULTIMEDIAKIT_INCLUDE_DIR ${QT_MOBILITY_PARENT_INCLUDE_DIR}/QtMultimediaKit)
-            SET(QT_MOBILITY_MULTIMEDIAKIT_LIBRARY QtMultimediaKit)
-        ENDIF()
-    ENDIF()
-
-ENDIF()
diff --git a/cockatrice/CMakeLists.txt b/cockatrice/CMakeLists.txt
index 1de79b78..17398e4b 100644
--- a/cockatrice/CMakeLists.txt
+++ b/cockatrice/CMakeLists.txt
@@ -139,36 +139,6 @@ ENDIF(APPLE)
 
 set(COCKATRICE_LIBS)
 
-# Qt4 stuff
-if(Qt4_FOUND)
-    if (NOT QT_QTMULTIMEDIA_FOUND)
-        FIND_PACKAGE(QtMobility REQUIRED)
-    endif()
-
-    SET(QT_USE_QTNETWORK TRUE)
-    SET(QT_USE_QTMULTIMEDIA TRUE)
-    SET(QT_USE_QTSVG TRUE)
-
-    # Include directories
-    INCLUDE(${QT_USE_FILE})
-    INCLUDE_DIRECTORIES(${QT_INCLUDES})
-    INCLUDE_DIRECTORIES(${QT_MOBILITY_INCLUDE_DIR})
-    INCLUDE_DIRECTORIES(${QT_MOBILITY_MULTIMEDIAKIT_INCLUDE_DIR})
-    LIST(APPEND COCKATRICE_LIBS ${QT_LIBRARIES})
-    LIST(APPEND COCKATRICE_LIBS ${QT_QTMAIN_LIBRARY})
-    LIST(APPEND COCKATRICE_LIBS ${QT_MOBILITY_MULTIMEDIAKIT_LIBRARY})
-
-    # Let cmake chew Qt4's translations and resource files
-    # Note: header files are MOC-ed automatically by cmake
-    IF(UPDATE_TRANSLATIONS)
-        QT4_CREATE_TRANSLATION(cockatrice_QM ${translate_SRCS} ${cockatrice_TS})
-    ELSE(UPDATE_TRANSLATIONS)
-        QT4_ADD_TRANSLATION(cockatrice_QM ${cockatrice_TS})
-    ENDIF(UPDATE_TRANSLATIONS)
-
-    QT4_ADD_RESOURCES(cockatrice_RESOURCES_RCC ${cockatrice_RESOURCES})
-endif()
-
 # qt5 stuff
 if(Qt5Widgets_FOUND)
     include_directories(${Qt5Widgets_INCLUDE_DIRS})
@@ -245,20 +215,12 @@ INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR})
 # Build cockatrice binary and link it
 ADD_EXECUTABLE(cockatrice WIN32 MACOSX_BUNDLE ${cockatrice_SOURCES} ${cockatrice_QM} ${cockatrice_RESOURCES_RCC} ${cockatrice_MOC_SRCS})
 
-if(Qt4_FOUND)
-    if(MSVC) 
-        set(QT_USE_QTMAIN true) 
-    endif() 
-    TARGET_LINK_LIBRARIES(cockatrice cockatrice_common ${COCKATRICE_LIBS})
-endif()
-if(Qt5Widgets_FOUND)
-    if(MSVC)
-        TARGET_LINK_LIBRARIES(cockatrice cockatrice_common Qt5::WinMain)
-    else()
-        TARGET_LINK_LIBRARIES(cockatrice cockatrice_common)
-    endif()
-    qt5_use_modules(cockatrice ${COCKATRICE_LIBS})
+if(MSVC)
+    TARGET_LINK_LIBRARIES(cockatrice cockatrice_common Qt5::WinMain)
+else()
+    TARGET_LINK_LIBRARIES(cockatrice cockatrice_common)
 endif()
+qt5_use_modules(cockatrice ${COCKATRICE_LIBS})
 
 if(UNIX)
     if(APPLE)
@@ -291,11 +253,9 @@ if(APPLE)
     set(qtconf_dest_dir cockatrice.app/Contents/Resources)
     get_filename_component(QT_LIBRARY_DIR "${QT_LIBRARY_DIR}/.." ABSOLUTE)
 
-    # qt4: codecs, iconengines, imageformats
-    # qt5: audio, iconengines, imageformats, platforms, printsupport
-
+    # qt5 plugins: audio, iconengines, imageformats, platforms, printsupport
     install(DIRECTORY "${QT_PLUGINS_DIR}/" DESTINATION ${plugin_dest_dir} COMPONENT Runtime
-        FILES_MATCHING REGEX "(audio|codecs|iconengines|imageformats|platforms|printsupport)/.*\\.dylib"
+        FILES_MATCHING REGEX "(audio|iconengines|imageformats|platforms|printsupport)/.*\\.dylib"
         REGEX ".*_debug\\.dylib" EXCLUDE)
 
     install(CODE "
@@ -319,11 +279,9 @@ if(WIN32)
     set(plugin_dest_dir Plugins)
     set(qtconf_dest_dir .)
 
-    # qt4: codecs, iconengines, imageformats
-    # qt5: audio, iconengines, imageformats, platforms, printsupport
-
+    # qt5 plugins: audio, iconengines, imageformats, platforms, printsupport
     install(DIRECTORY "${QT_PLUGINS_DIR}/" DESTINATION ${plugin_dest_dir} COMPONENT Runtime
-        FILES_MATCHING REGEX "(audio|codecs|iconengines|imageformats|platforms|printsupport)/.*[^d]\\.dll")
+        FILES_MATCHING REGEX "(audio|iconengines|imageformats|platforms|printsupport)/.*[^d]\\.dll")
 
     install(CODE "
         file(WRITE \"\${CMAKE_INSTALL_PREFIX}/${qtconf_dest_dir}/qt.conf\" \"[Paths]
diff --git a/cockatrice/src/abstractcounter.cpp b/cockatrice/src/abstractcounter.cpp
index 0b07d980..1ff3bcce 100644
--- a/cockatrice/src/abstractcounter.cpp
+++ b/cockatrice/src/abstractcounter.cpp
@@ -12,11 +12,7 @@
 AbstractCounter::AbstractCounter(Player *_player, int _id, const QString &_name, bool _shownInCounterArea, int _value, QGraphicsItem *parent)
     : QGraphicsItem(parent), player(_player), id(_id), name(_name), value(_value), hovered(false), aDec(0), aInc(0), dialogSemaphore(false), deleteAfterDialog(false), shownInCounterArea(_shownInCounterArea)
 {
-#if QT_VERSION < 0x050000
-    setAcceptsHoverEvents(true);
-#else
     setAcceptHoverEvents(true);
-#endif
 
     shortcutActive = false;
 
@@ -149,12 +145,7 @@ void AbstractCounter::setCounter()
     bool ok;
     dialogSemaphore = true;
     int newValue = 
-#if QT_VERSION < 0x050000
-    QInputDialog::getInteger(
-#else
-    QInputDialog::getInt(
-#endif
-        0, tr("Set counter"), tr("New value for counter '%1':").arg(name), value, -2000000000, 2000000000, 1, &ok);
+    QInputDialog::getInt(0, tr("Set counter"), tr("New value for counter '%1':").arg(name), value, -2000000000, 2000000000, 1, &ok);
     if (deleteAfterDialog) {
         deleteLater();
         return;
diff --git a/cockatrice/src/deckstats_interface.cpp b/cockatrice/src/deckstats_interface.cpp
index 6e73396d..a5884669 100644
--- a/cockatrice/src/deckstats_interface.cpp
+++ b/cockatrice/src/deckstats_interface.cpp
@@ -6,10 +6,7 @@
 #include <QRegExp>
 #include <QMessageBox>
 #include <QDesktopServices>
-
-#if QT_VERSION >= 0x050000
 #include <QUrlQuery>
-#endif
 
 DeckStatsInterface::DeckStatsInterface(
     CardDatabase &_cardDatabase,
@@ -50,19 +47,12 @@ void DeckStatsInterface::getAnalyzeRequestData(DeckList *deck, QByteArray *data)
     DeckList deckWithoutTokens;
     copyDeckWithoutTokens(*deck, deckWithoutTokens);
 
-#if QT_VERSION < 0x050000
-    QUrl params;
-    params.addQueryItem("deck", deckWithoutTokens.writeToString_Plain());
-    params.addQueryItem("decktitle", deck->getName());
-    data->append(params.encodedQuery());
-#else
     QUrl params;
     QUrlQuery urlQuery;
     urlQuery.addQueryItem("deck", deckWithoutTokens.writeToString_Plain());
     urlQuery.addQueryItem("decktitle", deck->getName());
     params.setQuery(urlQuery);
     data->append(params.query(QUrl::EncodeReserved));
-#endif
 }
 
 void DeckStatsInterface::analyzeDeck(DeckList *deck)
diff --git a/cockatrice/src/deckview.cpp b/cockatrice/src/deckview.cpp
index db0e3aba..5b68a687 100644
--- a/cockatrice/src/deckview.cpp
+++ b/cockatrice/src/deckview.cpp
@@ -65,11 +65,7 @@ void DeckViewCardDragItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 DeckViewCard::DeckViewCard(const QString &_name, const QString &_originZone, QGraphicsItem *parent)
     : AbstractCardItem(_name, 0, -1, parent), originZone(_originZone), dragItem(0)
 {
-#if QT_VERSION < 0x050000
-    setAcceptsHoverEvents(true);
-#else
     setAcceptHoverEvents(true);
-#endif
 }
 
 DeckViewCard::~DeckViewCard()
diff --git a/cockatrice/src/dlg_create_token.cpp b/cockatrice/src/dlg_create_token.cpp
index 02c867bb..311df360 100644
--- a/cockatrice/src/dlg_create_token.cpp
+++ b/cockatrice/src/dlg_create_token.cpp
@@ -83,11 +83,8 @@ DlgCreateToken::DlgCreateToken(const QStringList &_predefinedTokens, QWidget *pa
     chooseTokenView->setWordWrap(true);
     chooseTokenView->setColumnWidth(0, 130);
     chooseTokenView->setColumnWidth(3, 178);
-#if QT_VERSION < 0x050000
-    chooseTokenView->header()->setResizeMode(4, QHeaderView::ResizeToContents);
-#else
     chooseTokenView->header()->setSectionResizeMode(4, QHeaderView::ResizeToContents);
-#endif
+
     connect(chooseTokenView->selectionModel(), SIGNAL(currentRowChanged(QModelIndex, QModelIndex)), this, SLOT(tokenSelectionChanged(QModelIndex, QModelIndex)));
     
     if (predefinedTokens.isEmpty())
diff --git a/cockatrice/src/dlg_edit_tokens.cpp b/cockatrice/src/dlg_edit_tokens.cpp
index 89cf3e01..7293bc3a 100644
--- a/cockatrice/src/dlg_edit_tokens.cpp
+++ b/cockatrice/src/dlg_edit_tokens.cpp
@@ -77,13 +77,9 @@ DlgEditTokens::DlgEditTokens(QWidget *parent)
     chooseTokenView->header()->setStretchLastSection(false);
     chooseTokenView->header()->hideSection(1);
     chooseTokenView->header()->hideSection(2);
-#if QT_VERSION < 0x050000
-    chooseTokenView->header()->setResizeMode(3, QHeaderView::ResizeToContents);
-    chooseTokenView->header()->setResizeMode(4, QHeaderView::ResizeToContents);
-#else
     chooseTokenView->header()->setSectionResizeMode(3, QHeaderView::ResizeToContents);
     chooseTokenView->header()->setSectionResizeMode(4, QHeaderView::ResizeToContents);
-#endif
+
     connect(chooseTokenView->selectionModel(), SIGNAL(currentRowChanged(QModelIndex, QModelIndex)), this, SLOT(tokenSelectionChanged(QModelIndex, QModelIndex)));
     
     QAction *aAddToken = new QAction(tr("Add token"), this);
diff --git a/cockatrice/src/dlg_settings.cpp b/cockatrice/src/dlg_settings.cpp
index fe1676d9..e7d46679 100644
--- a/cockatrice/src/dlg_settings.cpp
+++ b/cockatrice/src/dlg_settings.cpp
@@ -697,11 +697,6 @@ SoundSettingsPage::SoundSettingsPage()
     connect(masterVolumeSlider, SIGNAL(valueChanged(int)), masterVolumeSpinBox, SLOT(setValue(int)));
     connect(masterVolumeSpinBox, SIGNAL(valueChanged(int)), masterVolumeSlider, SLOT(setValue(int)));
 
-#if QT_VERSION < 0x050000
-    masterVolumeSlider->setEnabled(false);
-    masterVolumeSpinBox->setEnabled(false);
-#endif
-
     QGridLayout *soundGrid = new QGridLayout;
     soundGrid->addWidget(&soundEnabledCheckBox, 0, 0, 1, 3);
     soundGrid->addWidget(&masterVolumeLabel, 1, 0);
@@ -736,12 +731,7 @@ void SoundSettingsPage::retranslateUi() {
     themeLabel.setText(tr("Current sounds theme:"));
     soundTestButton.setText(tr("Test system sound engine"));
     soundGroupBox->setTitle(tr("Sound settings"));
-    #if QT_VERSION < 0x050000
-    masterVolumeLabel.setText(tr("Master volume requires QT5"));
-#else
-    masterVolumeLabel.setText(tr("Master volume"));
-#endif
-    
+    masterVolumeLabel.setText(tr("Master volume"));    
 }
 
 DlgSettings::DlgSettings(QWidget *parent)
diff --git a/cockatrice/src/gameselector.cpp b/cockatrice/src/gameselector.cpp
index b471317e..802812b5 100644
--- a/cockatrice/src/gameselector.cpp
+++ b/cockatrice/src/gameselector.cpp
@@ -54,11 +54,8 @@ GameSelector::GameSelector(AbstractClient *_client, const TabSupervisor *_tabSup
     if (showfilters && restoresettings)
     	gameListProxyModel->loadFilterParameters(gameTypeMap);
 
-#if QT_VERSION < 0x050000
-    gameListView->header()->setResizeMode(0, QHeaderView::ResizeToContents);
-#else
     gameListView->header()->setSectionResizeMode(0, QHeaderView::ResizeToContents);
-#endif
+
     filterButton = new QPushButton;
     filterButton->setIcon(QPixmap("theme:icons/search"));
     connect(filterButton, SIGNAL(clicked()), this, SLOT(actSetFilter()));
diff --git a/cockatrice/src/handcounter.cpp b/cockatrice/src/handcounter.cpp
index c2e4ad6f..8b58b6a1 100644
--- a/cockatrice/src/handcounter.cpp
+++ b/cockatrice/src/handcounter.cpp
@@ -30,11 +30,7 @@ void HandCounter::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*op
     painter->save();
     QSize translatedSize = painter->combinedTransform().mapRect(boundingRect()).size().toSize();
     QPixmap cachedPixmap;
-#if QT_VERSION >= 0x040600
     if (!QPixmapCache::find("handCounter" + QString::number(translatedSize.width()), &cachedPixmap)) {
-#else
-    if (!QPixmapCache::find("handCounter" + QString::number(translatedSize.width()), cachedPixmap)) {
-#endif
         cachedPixmap = QPixmap("theme:hand").scaled(translatedSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);
         QPixmapCache::insert("handCounter" + QString::number(translatedSize.width()), cachedPixmap);
     }
diff --git a/cockatrice/src/main.cpp b/cockatrice/src/main.cpp
index 03a9d37e..793a008a 100644
--- a/cockatrice/src/main.cpp
+++ b/cockatrice/src/main.cpp
@@ -55,16 +55,6 @@ ThemeManager *themeManager;
 const QString translationPrefix = "cockatrice";
 QString translationPath;
 
-#if QT_VERSION < 0x050000
-static void myMessageOutput(QtMsgType /*type*/, const char *msg)
-{
-    QFile file("qdebug.txt");
-    file.open(QIODevice::WriteOnly | QIODevice::Truncate | QIODevice::Text);
-    QTextStream out(&file);
-    out << msg << endl;
-    file.close();
-}
-#else
 static void myMessageOutput(QtMsgType /*type*/, const QMessageLogContext &, const QString &msg)
 {
     QFile file("qdebug.txt");
@@ -73,7 +63,6 @@ static void myMessageOutput(QtMsgType /*type*/, const QMessageLogContext &, cons
     out << msg << endl;
     file.close();
 }
-#endif
 
 void installNewTranslator()
 {
@@ -103,22 +92,12 @@ int main(int argc, char *argv[])
     QApplication app(argc, argv);
 
     if (app.arguments().contains("--debug-output"))
-    {
-#if QT_VERSION < 0x050000
-        qInstallMsgHandler(myMessageOutput);
-#else
         qInstallMessageHandler(myMessageOutput);
-#endif
-    }
+
 #ifdef Q_OS_WIN
     app.addLibraryPath(app.applicationDirPath() + "/plugins");
 #endif
 
-#if QT_VERSION < 0x050000
-    // gone in Qt5, all source files _MUST_ be utf8-encoded
-    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));
-#endif
-
     QCoreApplication::setOrganizationName("Cockatrice");
     QCoreApplication::setOrganizationDomain("cockatrice.de");
     QCoreApplication::setApplicationName("Cockatrice");
@@ -158,9 +137,8 @@ int main(int argc, char *argv[])
 
     ui.show();
     qDebug("main(): ui.show() finished");
-#if QT_VERSION > 0x050000
+
     app.setAttribute(Qt::AA_UseHighDpiPixmaps);
-#endif
     app.exec();
 
     qDebug("Event loop finished, terminating...");
diff --git a/cockatrice/src/pilezone.cpp b/cockatrice/src/pilezone.cpp
index ed9daa88..a2ff1d14 100644
--- a/cockatrice/src/pilezone.cpp
+++ b/cockatrice/src/pilezone.cpp
@@ -13,11 +13,7 @@ PileZone::PileZone(Player *_p, const QString &_name, bool _isShufflable, bool _c
     : CardZone(_p, _name, false, _isShufflable, _contentsKnown, parent)
 {
     setCacheMode(DeviceCoordinateCache); // Do not move this line to the parent constructor!
-#if QT_VERSION < 0x050000
-    setAcceptsHoverEvents(true);
-#else
     setAcceptHoverEvents(true);
-#endif
     setCursor(Qt::OpenHandCursor);
     
     setTransform(QTransform().translate((float) CARD_WIDTH / 2, (float) CARD_HEIGHT / 2).rotate(90).translate((float) -CARD_WIDTH / 2, (float) -CARD_HEIGHT / 2));
diff --git a/cockatrice/src/player.cpp b/cockatrice/src/player.cpp
index 336cc542..790ec116 100644
--- a/cockatrice/src/player.cpp
+++ b/cockatrice/src/player.cpp
@@ -516,13 +516,7 @@ void Player::playerListActionTriggered()
     } else if (menu == mRevealTopCard) {
         int decksize = zones.value("deck")->getCards().size();
         bool ok;
-        int number = 
-#if QT_VERSION < 0x050000
-            QInputDialog::getInteger(
-#else
-            QInputDialog::getInt(
-#endif
-            0, tr("Reveal top cards of library"), tr("Number of cards: (max. %1)").arg(decksize), defaultNumberTopCards, 1, decksize, 1, &ok);
+        int number = QInputDialog::getInt(0, tr("Reveal top cards of library"), tr("Number of cards: (max. %1)").arg(decksize), defaultNumberTopCards, 1, decksize, 1, &ok);
         if (ok) {
             cmd.set_zone_name("deck");
             cmd.set_top_cards(number);
@@ -867,13 +861,7 @@ void Player::actViewLibrary()
 void Player::actViewTopCards()
 {
     bool ok;
-    int number = 
-#if QT_VERSION < 0x050000
-    QInputDialog::getInteger(
-#else
-    QInputDialog::getInt(
-#endif
-        0, tr("View top cards of library"), tr("Number of cards:"), defaultNumberTopCards, 1, 2000000000, 1, &ok);
+    int number = QInputDialog::getInt(0, tr("View top cards of library"), tr("Number of cards:"), defaultNumberTopCards, 1, 2000000000, 1, &ok);
     if (ok) {
         defaultNumberTopCards = number;
         static_cast<GameScene *>(scene())->toggleZoneView(this, "deck", number);
@@ -928,14 +916,8 @@ void Player::actMulligan()
 
 void Player::actDrawCards()
 {
-    int number = 
-#if QT_VERSION < 0x050000
-    QInputDialog::getInteger(
-#else
-    QInputDialog::getInt(
-#endif
-    0, tr("Draw cards"), tr("Number:"));
-        if (number) {
+    int number = QInputDialog::getInt(0, tr("Draw cards"), tr("Number:"));
+    if (number) {
         Command_DrawCards cmd;
         cmd.set_number(number);
         sendGameCommand(cmd);
@@ -949,13 +931,7 @@ void Player::actUndoDraw()
 
 void Player::actMoveTopCardsToGrave()
 {
-    int number = 
-#if QT_VERSION < 0x050000
-    QInputDialog::getInteger(
-#else
-    QInputDialog::getInt(
-#endif
-    0, tr("Move top cards to grave"), tr("Number:"));
+    int number = QInputDialog::getInt(0, tr("Move top cards to grave"), tr("Number:"));
     if (!number)
         return;
 
@@ -978,13 +954,7 @@ void Player::actMoveTopCardsToGrave()
 
 void Player::actMoveTopCardsToExile()
 {
-    int number =
-#if QT_VERSION < 0x050000
-    QInputDialog::getInteger(
-#else
-    QInputDialog::getInt(
-#endif
-    0, tr("Move top cards to exile"), tr("Number:"));
+    int number = QInputDialog::getInt(0, tr("Move top cards to exile"), tr("Number:"));
     if (!number)
         return;
 
@@ -1059,13 +1029,7 @@ void Player::actUntapAll()
 void Player::actRollDie()
 {
     bool ok;
-    int sides =
-#if QT_VERSION < 0x050000
-    QInputDialog::getInteger(
-#else
-    QInputDialog::getInt(
-#endif
-    static_cast<QWidget *>(parent()), tr("Roll die"), tr("Number of sides:"), 20, 2, 1000, 1, &ok);
+    int sides = QInputDialog::getInt(static_cast<QWidget *>(parent()), tr("Roll die"), tr("Number of sides:"), 20, 2, 1000, 1, &ok);
     if (ok) {
         Command_RollDie cmd;
         cmd.set_sides(sides);
@@ -2269,13 +2233,7 @@ void Player::actCardCounterTrigger()
         case 11: {
             bool ok;
             dialogSemaphore = true;
-            int number = 
-#if QT_VERSION < 0x050000
-                QInputDialog::getInteger(
-#else
-                QInputDialog::getInt(
-#endif
-                    0, tr("Set counters"), tr("Number:"), 0, 0, MAX_COUNTERS_ON_CARD, 1, &ok);
+            int number = QInputDialog::getInt(0, tr("Set counters"), tr("Number:"), 0, 0, MAX_COUNTERS_ON_CARD, 1, &ok);
             dialogSemaphore = false;
             if (clearCardsToDelete())
                 return;
diff --git a/cockatrice/src/playertarget.cpp b/cockatrice/src/playertarget.cpp
index 775c4bdd..22da4087 100644
--- a/cockatrice/src/playertarget.cpp
+++ b/cockatrice/src/playertarget.cpp
@@ -81,11 +81,7 @@ void PlayerTarget::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*o
     QSize translatedSize = translatedRect.size().toSize();
     QPixmap cachedPixmap;
     const QString cacheKey = "avatar" + QString::number(translatedSize.width()) + "_" + QString::number(info->user_level()) + "_" + QString::number(fullPixmap.cacheKey());
-#if QT_VERSION >= 0x040600
     if (!QPixmapCache::find(cacheKey, &cachedPixmap)) {
-#else
-    if (!QPixmapCache::find(cacheKey, cachedPixmap)) {
-#endif
         cachedPixmap = QPixmap(translatedSize.width(), translatedSize.height());
         
         QPainter tempPainter(&cachedPixmap);
diff --git a/cockatrice/src/priceupdater.cpp b/cockatrice/src/priceupdater.cpp
index 307cd26f..649becc6 100644
--- a/cockatrice/src/priceupdater.cpp
+++ b/cockatrice/src/priceupdater.cpp
@@ -12,11 +12,6 @@
 #include "main.h"
 #include "carddatabase.h"
 
-#if QT_VERSION < 0x050000
-    // for Qt::escape() 
-    #include <QtGui/qtextdocument.h>
-#endif
-
 /**
  * Constructor.
  *
@@ -137,12 +132,7 @@ void DBPriceUpdater::downloadFinished()
     if(resultMap.contains("errors"))
     {
         QMessageBox::critical(this, tr("Error"), tr("A problem has occured while fetching card prices:") + 
-            "<br/>" +
-#if QT_VERSION < 0x050000
-            Qt::escape(resultMap["errors"].toList().first().toString())
-#else
-            resultMap["errors"].toList().first().toString().toHtmlEscaped()
-#endif
+            "<br/>" + resultMap["errors"].toList().first().toString().toHtmlEscaped()
         );
         reply->deleteLater();
         if(urls.isEmpty())
diff --git a/cockatrice/src/remotedecklist_treewidget.cpp b/cockatrice/src/remotedecklist_treewidget.cpp
index cb96ef7f..d2f048f5 100644
--- a/cockatrice/src/remotedecklist_treewidget.cpp
+++ b/cockatrice/src/remotedecklist_treewidget.cpp
@@ -283,11 +283,7 @@ RemoteDeckList_TreeWidget::RemoteDeckList_TreeWidget(AbstractClient *_client, QW
     setModel(proxyModel);
     connect(treeModel, SIGNAL(treeRefreshed()), this, SLOT(expandAll()));
 
-#if QT_VERSION < 0x050000
-    header()->setResizeMode(QHeaderView::ResizeToContents);
-#else
     header()->setSectionResizeMode(QHeaderView::ResizeToContents);
-#endif
     setUniformRowHeights(true);
     setSortingEnabled(true);
     proxyModel->sort(0, Qt::AscendingOrder);
diff --git a/cockatrice/src/remotereplaylist_treewidget.cpp b/cockatrice/src/remotereplaylist_treewidget.cpp
index 680529dc..44807efc 100644
--- a/cockatrice/src/remotereplaylist_treewidget.cpp
+++ b/cockatrice/src/remotereplaylist_treewidget.cpp
@@ -278,11 +278,7 @@ RemoteReplayList_TreeWidget::RemoteReplayList_TreeWidget(AbstractClient *_client
     proxyModel->setSortCaseSensitivity(Qt::CaseInsensitive);
     setModel(proxyModel);
 
-#if QT_VERSION < 0x050000
-    header()->setResizeMode(QHeaderView::ResizeToContents);
-#else
     header()->setSectionResizeMode(QHeaderView::ResizeToContents);
-#endif
     header()->setStretchLastSection(false);
     setUniformRowHeights(true);
     setSortingEnabled(true);
diff --git a/cockatrice/src/settingscache.cpp b/cockatrice/src/settingscache.cpp
index 7c43134c..2d7022c2 100644
--- a/cockatrice/src/settingscache.cpp
+++ b/cockatrice/src/settingscache.cpp
@@ -4,22 +4,15 @@
 #include <QDir>
 #include <QDebug>
 #include <QApplication>
-
-#if QT_VERSION >= 0x050000
-    #include <QStandardPaths>
-#else
-    #include <QDesktopServices>
-#endif
+#include <QStandardPaths>
 
 QString SettingsCache::getDataPath()
 {
     return 
 #ifdef PORTABLE_BUILD
     qApp->applicationDirPath() + "/data/";
-#elif QT_VERSION >= 0x050000
-    QStandardPaths::writableLocation(QStandardPaths::DataLocation);
 #else
-    QDesktopServices::storageLocation(QDesktopServices::DataLocation);
+    QStandardPaths::writableLocation(QStandardPaths::DataLocation);
 #endif
 }
 
diff --git a/cockatrice/src/soundengine.cpp b/cockatrice/src/soundengine.cpp
index 1cdf1454..a1569238 100644
--- a/cockatrice/src/soundengine.cpp
+++ b/cockatrice/src/soundengine.cpp
@@ -7,11 +7,7 @@
 #include <QDebug>
 #include <QFileInfo>
 #include <QLibraryInfo>
-#if QT_VERSION < 0x050000
-    #include <QDesktopServices>
-#else
-    #include <QStandardPaths>
-#endif
+#include <QStandardPaths>
 
 #define DEFAULT_THEME_NAME "Default"
 #define TEST_SOUND_FILENAME "player_join"
@@ -47,13 +43,8 @@ void SoundEngine::soundEnabledChanged()
         if(!player)
         {
             QAudioFormat format;
-#if QT_VERSION < 0x050000
-            format.setFrequency(44100);
-            format.setChannels(1);
- #else
             format.setSampleRate(44100);
             format.setChannelCount(1);
- #endif
             format.setSampleSize(16);
             format.setCodec("audio/pcm");
             format.setByteOrder(QAudioFormat::LittleEndian);
@@ -88,9 +79,8 @@ void SoundEngine::playSound(QString fileName)
     inputBuffer->close();
     inputBuffer->setData(audioData[fileName]);
     inputBuffer->open(QIODevice::ReadOnly);
-#if QT_VERSION >= 0x050000
+
     player->setVolume(settingsCache->getMasterVolume() / 100.0);
-#endif
     player->stop();
     player->start(inputBuffer);
 }
@@ -119,8 +109,6 @@ QStringMap & SoundEngine::getAvailableThemes()
     dir =
 #ifdef PORTABLE_BUILD
         qApp->applicationDirPath() +
-#elif QT_VERSION < 0x050000
-        QDesktopServices::storageLocation(QDesktopServices::DataLocation) +
 #else
         QStandardPaths::standardLocations(QStandardPaths::DataLocation).first() +
 #endif
diff --git a/cockatrice/src/tab_deck_editor.cpp b/cockatrice/src/tab_deck_editor.cpp
index dfba8c03..d06fb531 100644
--- a/cockatrice/src/tab_deck_editor.cpp
+++ b/cockatrice/src/tab_deck_editor.cpp
@@ -60,11 +60,7 @@ void TabDeckEditor::createDeckDock()
     deckView->setUniformRowHeights(true);
     deckView->setSortingEnabled(true);
     deckView->sortByColumn(1, Qt::AscendingOrder);
-#if QT_VERSION < 0x050000
-    deckView->header()->setResizeMode(QHeaderView::ResizeToContents);
-#else
     deckView->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
-#endif
     deckView->installEventFilter(&deckViewKeySignals);
     connect(deckView->selectionModel(), SIGNAL(currentRowChanged(const QModelIndex &, const QModelIndex &)), this, SLOT(updateCardInfoRight(const QModelIndex &, const QModelIndex &)));
     connect(deckView, SIGNAL(doubleClicked(const QModelIndex &)), this, SLOT(actSwapCard()));
diff --git a/cockatrice/src/tab_deck_storage.cpp b/cockatrice/src/tab_deck_storage.cpp
index 90986b12..be0f39bd 100644
--- a/cockatrice/src/tab_deck_storage.cpp
+++ b/cockatrice/src/tab_deck_storage.cpp
@@ -38,11 +38,7 @@ TabDeckStorage::TabDeckStorage(TabSupervisor *_tabSupervisor, AbstractClient *_c
     localDirView->setColumnHidden(1, true);
     localDirView->setRootIndex(localDirModel->index(localDirModel->rootPath(), 0));
     localDirView->setSortingEnabled(true);
-#if QT_VERSION < 0x050000
-    localDirView->header()->setResizeMode(QHeaderView::ResizeToContents);
-#else
     localDirView->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
-#endif
     localDirView->header()->setSortIndicator(0, Qt::AscendingOrder);
     
     leftToolBar = new QToolBar;
diff --git a/cockatrice/src/tab_game.cpp b/cockatrice/src/tab_game.cpp
index 075f9880..7a47e4c2 100644
--- a/cockatrice/src/tab_game.cpp
+++ b/cockatrice/src/tab_game.cpp
@@ -1581,10 +1581,7 @@ void TabGame::createMessageDock(bool bReplay)
         completer = new QCompleter(autocompleteUserList, sayEdit);
         completer->setCaseSensitivity(Qt::CaseInsensitive);
         completer->setMaxVisibleItems(5);
-
-    #if QT_VERSION >= 0x050000
         completer->setFilterMode(Qt::MatchStartsWith);
-    #endif
 
         sayEdit->setCompleter(completer);
         actCompleterChanged();
diff --git a/cockatrice/src/tab_logs.cpp b/cockatrice/src/tab_logs.cpp
index f1b6563a..8add93a8 100644
--- a/cockatrice/src/tab_logs.cpp
+++ b/cockatrice/src/tab_logs.cpp
@@ -17,9 +17,7 @@
 #include "pb/response_viewlog_history.pb.h"
 
 #include <QtGui>
-#if QT_VERSION >= 0x050000
 #include <QtWidgets>
-#endif
 
 TabLog::TabLog(TabSupervisor *_tabSupervisor, AbstractClient *_client, QWidget *parent)
     : Tab(_tabSupervisor, parent), client(_client)
diff --git a/cockatrice/src/tab_replays.cpp b/cockatrice/src/tab_replays.cpp
index 0860a5ea..a0fa6764 100644
--- a/cockatrice/src/tab_replays.cpp
+++ b/cockatrice/src/tab_replays.cpp
@@ -36,11 +36,7 @@ TabReplays::TabReplays(TabSupervisor *_tabSupervisor, AbstractClient *_client)
     localDirView->setColumnHidden(1, true);
     localDirView->setRootIndex(localDirModel->index(localDirModel->rootPath(), 0));
     localDirView->setSortingEnabled(true);
-#if QT_VERSION < 0x050000
-    localDirView->header()->setResizeMode(QHeaderView::ResizeToContents);
-#else
     localDirView->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
-#endif
     localDirView->header()->setSortIndicator(0, Qt::AscendingOrder);
     
     leftToolBar = new QToolBar;
diff --git a/cockatrice/src/tab_room.cpp b/cockatrice/src/tab_room.cpp
index b455befd..95356a57 100644
--- a/cockatrice/src/tab_room.cpp
+++ b/cockatrice/src/tab_room.cpp
@@ -118,10 +118,7 @@ TabRoom::TabRoom(TabSupervisor *_tabSupervisor, AbstractClient *_client, ServerI
     completer = new QCompleter(autocompleteUserList, sayEdit);
     completer->setCaseSensitivity(Qt::CaseInsensitive);
     completer->setMaxVisibleItems(5);
-
-    #if QT_VERSION >= 0x050000
-        completer->setFilterMode(Qt::MatchStartsWith);
-    #endif
+    completer->setFilterMode(Qt::MatchStartsWith);
 
     sayEdit->setCompleter(completer);
     actCompleterChanged();
diff --git a/cockatrice/src/tab_server.cpp b/cockatrice/src/tab_server.cpp
index 0abd12c5..c203d363 100644
--- a/cockatrice/src/tab_server.cpp
+++ b/cockatrice/src/tab_server.cpp
@@ -28,17 +28,11 @@ RoomSelector::RoomSelector(AbstractClient *_client, QWidget *parent)
     roomList->setRootIsDecorated(false);
     roomList->setColumnCount(5);
     roomList->header()->setStretchLastSection(false);
-#if QT_VERSION < 0x050000
-    roomList->header()->setResizeMode(0, QHeaderView::ResizeToContents);
-    roomList->header()->setResizeMode(1, QHeaderView::Stretch);
-    roomList->header()->setResizeMode(2, QHeaderView::ResizeToContents);
-    roomList->header()->setResizeMode(3, QHeaderView::ResizeToContents);
-#else
     roomList->header()->setSectionResizeMode(0, QHeaderView::ResizeToContents);
     roomList->header()->setSectionResizeMode(1, QHeaderView::Stretch);
     roomList->header()->setSectionResizeMode(2, QHeaderView::ResizeToContents);
     roomList->header()->setSectionResizeMode(3, QHeaderView::ResizeToContents);
-#endif    
+
     joinButton = new QPushButton;
     connect(joinButton, SIGNAL(clicked()), this, SLOT(joinClicked()));
     QHBoxLayout *buttonLayout = new QHBoxLayout;
diff --git a/cockatrice/src/tablezone.cpp b/cockatrice/src/tablezone.cpp
index a38a5eb4..532f492d 100644
--- a/cockatrice/src/tablezone.cpp
+++ b/cockatrice/src/tablezone.cpp
@@ -35,11 +35,7 @@ TableZone::TableZone(Player *_p, QGraphicsItem *parent)
     currentMinimumWidth = width;
 
     setCacheMode(DeviceCoordinateCache);
-#if QT_VERSION < 0x050000
-    setAcceptsHoverEvents(true);
-#else
     setAcceptHoverEvents(true);
-#endif
 }
 
 
diff --git a/cockatrice/src/thememanager.cpp b/cockatrice/src/thememanager.cpp
index 390d859a..4f99674d 100644
--- a/cockatrice/src/thememanager.cpp
+++ b/cockatrice/src/thememanager.cpp
@@ -5,11 +5,7 @@
 #include <QColor>
 #include <QPixmapCache>
 #include <QLibraryInfo>
-#if QT_VERSION < 0x050000
-    #include <QDesktopServices>
-#else
-    #include <QStandardPaths>
-#endif
+#include <QStandardPaths>
 
 #define DEFAULT_THEME_NAME "Default"
 #define STYLE_CSS_NAME "style.css"
@@ -45,8 +41,6 @@ QStringMap & ThemeManager::getAvailableThemes()
     dir =
 #ifdef PORTABLE_BUILD
         qApp->applicationDirPath() +
-#elif QT_VERSION < 0x050000
-        QDesktopServices::storageLocation(QDesktopServices::DataLocation) +
 #else
         QStandardPaths::standardLocations(QStandardPaths::DataLocation).first() +
 #endif
diff --git a/cockatrice/src/user_context_menu.cpp b/cockatrice/src/user_context_menu.cpp
index 95761929..c7c9957e 100644
--- a/cockatrice/src/user_context_menu.cpp
+++ b/cockatrice/src/user_context_menu.cpp
@@ -12,10 +12,8 @@
 #include "pending_command.h"
 
 #include <QtGui>
-#if QT_VERSION >= 0x050000
 #include <QtWidgets>
 #include <QSignalMapper>
-#endif
 
 #include "pb/commands.pb.h"
 #include "pb/session_commands.pb.h"
diff --git a/cockatrice/src/userlist.cpp b/cockatrice/src/userlist.cpp
index 25868505..e7821ca7 100644
--- a/cockatrice/src/userlist.cpp
+++ b/cockatrice/src/userlist.cpp
@@ -311,11 +311,7 @@ UserList::UserList(TabSupervisor *_tabSupervisor, AbstractClient *_client, UserL
     
     userTree = new QTreeWidget;
     userTree->setColumnCount(3);
-#if QT_VERSION < 0x050000
-    userTree->header()->setResizeMode(QHeaderView::ResizeToContents);
-#else
     userTree->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
-#endif
     userTree->setHeaderHidden(true);
     userTree->setRootIsDecorated(false);
     userTree->setIconSize(QSize(20, 12));
diff --git a/cockatrice/src/window_main.cpp b/cockatrice/src/window_main.cpp
index a6a752b4..6b1ceb5b 100644
--- a/cockatrice/src/window_main.cpp
+++ b/cockatrice/src/window_main.cpp
@@ -31,12 +31,7 @@
 #include <QSystemTrayIcon>
 #include <QApplication>
 #include <QtNetwork>
-
-#if QT_VERSION < 0x050000
-    #include <QtGui/qtextdocument.h> // for Qt::escape()
-#else 
-    #include <QtConcurrent>
-#endif
+#include <QtConcurrent>
 
 #include "main.h"
 #include "window_main.h"
@@ -397,15 +392,7 @@ QString MainWindow::extractInvalidUsernameMessage(QString & in)
         out += "<li>" + tr("can %1 contain numeric characters").arg((rules.at(4).toInt() > 0) ? "" : tr("NOT")) + "</li>";
 
         if (rules.at(6).size() > 0)
-        {
-            out += "<li>" + tr("can contain the following punctuation: %1").arg(
-                #if QT_VERSION < 0x050000
-                    Qt::escape(rules.at(6))
-                #else
-                    rules.at(6).toHtmlEscaped()
-                #endif
-            ) + "</li>";
-        }
+            out += "<li>" + tr("can contain the following punctuation: %1").arg(rules.at(6).toHtmlEscaped()) + "</li>";
 
         out += "<li>" + tr("first character can %1 be a punctuation mark").arg((rules.at(5).toInt() > 0) ? "" : tr("NOT")) + "</li>";
         out += "</ul>";
diff --git a/cockatrice/src/window_sets.cpp b/cockatrice/src/window_sets.cpp
index 5e0a49e2..e62ae30b 100644
--- a/cockatrice/src/window_sets.cpp
+++ b/cockatrice/src/window_sets.cpp
@@ -70,13 +70,8 @@ WndSets::WndSets(QWidget *parent)
     view->setDropIndicatorShown(true);
     view->setDragDropMode(QAbstractItemView::InternalMove);
 
-#if QT_VERSION < 0x050000
-    view->header()->setResizeMode(QHeaderView::Stretch);
-    view->header()->setResizeMode(SetsModel::LongNameCol, QHeaderView::ResizeToContents);
-#else
     view->header()->setSectionResizeMode(QHeaderView::Stretch);
     view->header()->setSectionResizeMode(SetsModel::LongNameCol, QHeaderView::ResizeToContents);
-#endif
 
     view->sortByColumn(SetsModel::SortKeyCol, Qt::AscendingOrder);
     view->setColumnHidden(SetsModel::SortKeyCol, true);
diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
index 0aabfbd5..10797924 100644
--- a/common/CMakeLists.txt
+++ b/common/CMakeLists.txt
@@ -30,21 +30,10 @@ SET(common_SOURCES
 
 set(ORACLE_LIBS)
 
-# Qt4 stuff
-if(Qt4_FOUND)
-    # Include directories
-    INCLUDE(${QT_USE_FILE})
-    include_directories(${QT_INCLUDES})
-endif()
-
-# qt5 stuff
-if(Qt5Widgets_FOUND)
-    include_directories(${Qt5Widgets_INCLUDE_DIRS})
-endif()
-
 INCLUDE_DIRECTORIES(pb)
 INCLUDE_DIRECTORIES(sfmt)
 INCLUDE_DIRECTORIES(${PROTOBUF_INCLUDE_DIR})
+include_directories(${Qt5Widgets_INCLUDE_DIRS})
 INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR})
 
 add_library(cockatrice_common ${common_SOURCES} ${common_MOC_SRCS})
diff --git a/oracle/CMakeLists.txt b/oracle/CMakeLists.txt
index 1011fa83..70fc2ec5 100644
--- a/oracle/CMakeLists.txt
+++ b/oracle/CMakeLists.txt
@@ -47,28 +47,6 @@ ENDIF(APPLE)
 
 set(ORACLE_LIBS)
 
-# Qt4 stuff
-if(Qt4_FOUND)
-    SET(QT_USE_QTNETWORK TRUE)
-    SET(QT_USE_QTSVG TRUE)
-
-    # Include directories
-    INCLUDE(${QT_USE_FILE})
-    include_directories(${QT_INCLUDES})
-    LIST(APPEND ORACLE_LIBS ${QT_QTMAIN_LIBRARY})
-    LIST(APPEND ORACLE_LIBS ${QT_LIBRARIES})
-
-    # Let cmake chew Qt4's translations and resource files
-    # Note: header files are MOC-ed automatically by cmake
-    IF(UPDATE_TRANSLATIONS)
-        QT4_CREATE_TRANSLATION(oracle_QM ${translate_SRCS} ${oracle_TS})
-    ELSE(UPDATE_TRANSLATIONS)
-        QT4_ADD_TRANSLATION(oracle_QM ${oracle_TS})
-    ENDIF(UPDATE_TRANSLATIONS)
-
-    QT4_ADD_RESOURCES(oracle_RESOURCES_RCC ${oracle_RESOURCES})
-endif()
-
 # qt5 stuff
 if(Qt5Widgets_FOUND)
     include_directories(${Qt5Widgets_INCLUDE_DIRS})
@@ -131,18 +109,10 @@ ENDIF()
 # Build oracle binary and link it
 ADD_EXECUTABLE(oracle WIN32 MACOSX_BUNDLE ${oracle_SOURCES} ${oracle_QM} ${oracle_RESOURCES_RCC} ${oracle_MOC_SRCS})
 
-if(Qt4_FOUND)
-    if(MSVC) 
-        set(QT_USE_QTMAIN true) 
-    endif() 
-    TARGET_LINK_LIBRARIES(oracle ${ORACLE_LIBS})
-endif()
-if(Qt5Widgets_FOUND)
-    if(MSVC)
-        TARGET_LINK_LIBRARIES(oracle Qt5::WinMain)
-    endif()
-    qt5_use_modules(oracle ${ORACLE_LIBS})
+if(MSVC)
+    TARGET_LINK_LIBRARIES(oracle Qt5::WinMain)
 endif()
+qt5_use_modules(oracle ${ORACLE_LIBS})
 
 IF(ZLIB_FOUND)
     TARGET_LINK_LIBRARIES(oracle ${ZLIB_LIBRARIES})
@@ -182,11 +152,9 @@ if(APPLE)
     set(qtconf_dest_dir oracle.app/Contents/Resources)
     get_filename_component(QT_LIBRARY_DIR "${QT_LIBRARY_DIR}/.." ABSOLUTE)
 
-    # qt4: codecs, iconengines, imageformats
-    # qt5: iconengines, platforms
-
+    # qt5 plugins: iconengines, platforms
     install(DIRECTORY "${QT_PLUGINS_DIR}/" DESTINATION ${plugin_dest_dir} COMPONENT Runtime
-        FILES_MATCHING REGEX "(codecs|iconengines|platforms)/.*\\.dylib"
+        FILES_MATCHING REGEX "(iconengines|platforms)/.*\\.dylib"
         REGEX ".*_debug\\.dylib" EXCLUDE)
 
     install(CODE "
@@ -218,11 +186,10 @@ IF(WIN32)
         list(APPEND libSearchDirs ${ZLIB_DLL_DIR})
     ENDIF()
 
-    # qt4: codecs, iconengines, imageformats
-    # qt5: iconengines, imageformats, platforms
+    # qt5 plugins: iconengines, platforms
 
     install(DIRECTORY "${QT_PLUGINS_DIR}/" DESTINATION ${plugin_dest_dir} COMPONENT Runtime
-        FILES_MATCHING REGEX "(codecs|iconengines|platforms)/.*[^d]\\.dll")
+        FILES_MATCHING REGEX "(iconengines|platforms)/.*[^d]\\.dll")
 
     install(CODE "
         file(WRITE \"\${CMAKE_INSTALL_PREFIX}/${qtconf_dest_dir}/qt.conf\" \"[Paths]
diff --git a/oracle/src/main.cpp b/oracle/src/main.cpp
index 5a6e0367..8d272328 100644
--- a/oracle/src/main.cpp
+++ b/oracle/src/main.cpp
@@ -30,11 +30,6 @@ int main(int argc, char *argv[])
 {
 	QApplication app(argc, argv);
 
-#if QT_VERSION < 0x050000
-	// gone in Qt5, all source files _MUST_ be utf8-encoded
-	QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));
-#endif
-
 	QCoreApplication::setOrganizationName("Cockatrice");
 	QCoreApplication::setOrganizationDomain("cockatrice");
 	// this can't be changed, as it influences the default savepath for cards.xml
diff --git a/oracle/src/oracleimporter.cpp b/oracle/src/oracleimporter.cpp
index e39bcc06..92f22c16 100644
--- a/oracle/src/oracleimporter.cpp
+++ b/oracle/src/oracleimporter.cpp
@@ -1,9 +1,6 @@
 #include "oracleimporter.h"
-#if QT_VERSION < 0x050000
-    #include <QtGui>
-#else
-    #include <QtWidgets>
-#endif
+
+#include <QtWidgets>
 #include <QDebug>
 
 #include "qt-json/json.h"
diff --git a/oracle/src/oraclewizard.cpp b/oracle/src/oraclewizard.cpp
index 394c2835..47805850 100644
--- a/oracle/src/oraclewizard.cpp
+++ b/oracle/src/oraclewizard.cpp
@@ -1,10 +1,6 @@
 #include <QtGui>
-#if QT_VERSION < 0x050000
-    #include <QDesktopServices>
-#else 
-    #include <QStandardPaths>
-    #include <QtConcurrent>
-#endif
+#include <QStandardPaths>
+#include <QtConcurrent>
 #include <QAbstractButton>
 #include <QBuffer>
 #include <QCheckBox>
diff --git a/servatrice/CMakeLists.txt b/servatrice/CMakeLists.txt
index 7c2bcb0e..0f717390 100644
--- a/servatrice/CMakeLists.txt
+++ b/servatrice/CMakeLists.txt
@@ -38,22 +38,6 @@ ENDIF(APPLE)
 
 set(SERVATRICE_LIBS)
 
-# Qt4 stuff
-if(Qt4_FOUND)
-    SET(QT_USE_QTNETWORK TRUE)
-    SET(QT_USE_QTSQL TRUE)
-
-    # Include directories
-    INCLUDE(${QT_USE_FILE})
-    include_directories(${QT_INCLUDES})
-    LIST(APPEND SERVATRICE_LIBS ${QT_LIBRARIES})
-
-    # Libgcrypt is required only with Qt4 to support SHA512 hashing
-    FIND_PACKAGE(Libgcrypt REQUIRED)
-    INCLUDE_DIRECTORIES(${LIBGCRYPT_INCLUDE_DIR})
-    QT4_ADD_RESOURCES(servatrice_RESOURCES_RCC ${servatrice_RESOURCES})
-endif()
-
 # qt5 stuff
 if(Qt5Widgets_FOUND)
     include_directories(${Qt5Widgets_INCLUDE_DIRS})
@@ -118,20 +102,12 @@ INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR})
 # Build servatrice binary and link it
 ADD_EXECUTABLE(servatrice MACOSX_BUNDLE ${servatrice_SOURCES} ${servatrice_RESOURCES_RCC} ${servatrice_MOC_SRCS})
 
-if(Qt4_FOUND)
-    if(MSVC) 
-        set(QT_USE_QTMAIN true) 
-    endif() 
-    TARGET_LINK_LIBRARIES(servatrice cockatrice_common ${SERVATRICE_LIBS} ${LIBGCRYPT_LIBRARY} ${CMAKE_THREAD_LIBS_INIT})
-endif()
-if(Qt5Widgets_FOUND)
-    if(MSVC)
-        TARGET_LINK_LIBRARIES(servatrice cockatrice_common ${LIBGCRYPT_LIBRARY} ${CMAKE_THREAD_LIBS_INIT} Qt5::WinMain)
-    else()
-        TARGET_LINK_LIBRARIES(servatrice cockatrice_common ${LIBGCRYPT_LIBRARY} ${CMAKE_THREAD_LIBS_INIT})
-    endif()
-    qt5_use_modules(servatrice ${SERVATRICE_LIBS})
+if(MSVC)
+    TARGET_LINK_LIBRARIES(servatrice cockatrice_common ${CMAKE_THREAD_LIBS_INIT} Qt5::WinMain)
+else()
+    TARGET_LINK_LIBRARIES(servatrice cockatrice_common ${CMAKE_THREAD_LIBS_INIT})
 endif()
+qt5_use_modules(servatrice ${SERVATRICE_LIBS})
 
 # install rules
 if(UNIX)
@@ -168,11 +144,9 @@ if(APPLE)
     set(qtconf_dest_dir servatrice.app/Contents/Resources)
     get_filename_component(QT_LIBRARY_DIR "${QT_LIBRARY_DIR}/.." ABSOLUTE)
 
-    # qt4: codecs, sqldrivers
-    # qt5: platforms, sqldrivers
-
+    # qt5 plugins: platforms, sqldrivers/mysql
     install(DIRECTORY "${QT_PLUGINS_DIR}/" DESTINATION ${plugin_dest_dir} COMPONENT Runtime
-        FILES_MATCHING REGEX "(codecs/.*|platforms/.*|sqldrivers/libqsqlmysql)\\.dylib"
+        FILES_MATCHING REGEX "(platforms/.*|sqldrivers/libqsqlmysql)\\.dylib"
         REGEX ".*_debug\\.dylib" EXCLUDE)
 
     install(CODE "
@@ -195,11 +169,9 @@ if(WIN32)
     set(plugin_dest_dir Plugins)
     set(qtconf_dest_dir .)
 
-    # qt4: codecs, sqldrivers
-    # qt5: platforms, sqldrivers
-
+    # qt5 plugins: platforms, sqldrivers/mysql
     install(DIRECTORY "${QT_PLUGINS_DIR}/" DESTINATION ${plugin_dest_dir} COMPONENT Runtime
-        FILES_MATCHING REGEX "(codecs/.*|platforms/.*|sqldrivers/qsqlmysql)\\.dll"
+        FILES_MATCHING REGEX "(platforms/.*|sqldrivers/qsqlmysql)\\.dll"
         REGEX ".*d\\.dll" EXCLUDE)
 
     install(CODE "
diff --git a/servatrice/src/main.cpp b/servatrice/src/main.cpp
index d19ebb66..eb630f76 100644
--- a/servatrice/src/main.cpp
+++ b/servatrice/src/main.cpp
@@ -45,13 +45,8 @@ SmtpClient *smtpClient;
 
 void testRNG();
 void testHash();
-#if QT_VERSION < 0x050000
-void myMessageOutput(QtMsgType type, const char *msg);
-void myMessageOutput2(QtMsgType type, const char *msg);
-#else
 void myMessageOutput(QtMsgType type, const QMessageLogContext &, const QString &msg);
 void myMessageOutput2(QtMsgType type, const QMessageLogContext &, const QString &msg);
-#endif
 
 /* Implementations */
 
@@ -100,18 +95,6 @@ void testHash()
 	std::cerr << startTime.secsTo(endTime) << "secs" << std::endl;
 }
 
-#if QT_VERSION < 0x050000
-void myMessageOutput(QtMsgType /*type*/, const char *msg)
-{
-	logger->logMessage(msg);
-}
-
-void myMessageOutput2(QtMsgType /*type*/, const char *msg)
-{
-	logger->logMessage(msg);
-	std::cerr << msg << std::endl;
-}
-#else
 void myMessageOutput(QtMsgType /*type*/, const QMessageLogContext &, const QString &msg)
 {
 	logger->logMessage(msg);
@@ -122,7 +105,6 @@ void myMessageOutput2(QtMsgType /*type*/, const QMessageLogContext &, const QStr
 	logger->logMessage(msg);
 	std::cerr << msg.toStdString() << std::endl;
 }
-#endif
 
 int main(int argc, char *argv[])
 {
@@ -141,11 +123,6 @@ int main(int argc, char *argv[])
 	
 	qRegisterMetaType<QList<int> >("QList<int>");
 
-#if QT_VERSION < 0x050000
-	// gone in Qt5, all source files _MUST_ be utf8-encoded
-	QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));
-#endif
-
 	configPath = SettingsCache::guessConfigurationPath(configPath);
 	qWarning() << "Using configuration file: " << configPath;
 	settingsCache = new SettingsCache(configPath);
@@ -158,17 +135,10 @@ int main(int argc, char *argv[])
 	loggerThread->start();
 	QMetaObject::invokeMethod(logger, "startLog", Qt::BlockingQueuedConnection, Q_ARG(QString, settingsCache->value("server/logfile", QString("server.log")).toString()));
 
-#if QT_VERSION < 0x050000
-	if (logToConsole)
-		qInstallMsgHandler(myMessageOutput);
-	else
-		qInstallMsgHandler(myMessageOutput2);
-#else
 	if (logToConsole)
 		qInstallMessageHandler(myMessageOutput);
 	else
 		qInstallMessageHandler(myMessageOutput2);
-#endif
 
 	signalhandler = new SignalHandler();
 
@@ -193,11 +163,7 @@ int main(int argc, char *argv[])
 		std::cerr << "-------------------------" << std::endl;
 		std::cerr << "Server initialized." << std::endl;
 
-#if QT_VERSION < 0x050000		
-		qInstallMsgHandler(myMessageOutput);
-#else
 		qInstallMessageHandler(myMessageOutput);
-#endif
 
 		retval = app.exec();
 		
diff --git a/servatrice/src/passwordhasher.cpp b/servatrice/src/passwordhasher.cpp
index 41e73b9e..ff9536e5 100644
--- a/servatrice/src/passwordhasher.cpp
+++ b/servatrice/src/passwordhasher.cpp
@@ -1,44 +1,13 @@
 #include "passwordhasher.h"
 
-#if QT_VERSION < 0x050000
-    #include <stdio.h>
-    #include <string.h>
-    #include <gcrypt.h>
-#endif
-
 #include <QCryptographicHash>
 #include "rng_sfmt.h"
 
 void PasswordHasher::initialize()
 {
-#if QT_VERSION < 0x050000
-    // These calls are required by libgcrypt before we use any of its functions.
-    gcry_check_version(0);
-    gcry_control(GCRYCTL_DISABLE_SECMEM, 0);
-    gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
-#endif
+    // dummy
 }
 
-#if QT_VERSION < 0x050000
-QString PasswordHasher::computeHash(const QString &password, const QString &salt)
-{
-    const int algo = GCRY_MD_SHA512;
-    const int rounds = 1000;
-
-    QByteArray passwordBuffer = (salt + password).toUtf8();
-    int hashLen = gcry_md_get_algo_dlen(algo);
-    char *hash = new char[hashLen], *tmp = new char[hashLen];
-    gcry_md_hash_buffer(algo, hash, passwordBuffer.data(), passwordBuffer.size());
-    for (int i = 1; i < rounds; ++i) {
-        memcpy(tmp, hash, hashLen);
-        gcry_md_hash_buffer(algo, hash, tmp, hashLen);
-    }
-    QString hashedPass = salt + QString(QByteArray(hash, hashLen).toBase64());
-    delete[] tmp;
-    delete[] hash;
-    return hashedPass;
-}
-#else
 QString PasswordHasher::computeHash(const QString &password, const QString &salt)
 {
     QCryptographicHash::Algorithm algo = QCryptographicHash::Sha512;
@@ -51,7 +20,6 @@ QString PasswordHasher::computeHash(const QString &password, const QString &salt
     QString hashedPass = salt + QString(hash.toBase64());
     return hashedPass;
 }
-#endif
 
 QString PasswordHasher::generateRandomSalt(const int len)
 {
diff --git a/servatrice/src/servatrice.cpp b/servatrice/src/servatrice.cpp
index dfd3967f..5f693c89 100644
--- a/servatrice/src/servatrice.cpp
+++ b/servatrice/src/servatrice.cpp
@@ -81,11 +81,7 @@ Servatrice_GameServer::~Servatrice_GameServer()
     }
 }
 
-#if QT_VERSION < 0x050000
-void Servatrice_GameServer::incomingConnection(int socketDescriptor)
-#else
 void Servatrice_GameServer::incomingConnection(qintptr socketDescriptor)
-#endif
 {
     // Determine connection pool with smallest client count
     int minClientCount = -1;
@@ -110,11 +106,7 @@ void Servatrice_GameServer::incomingConnection(qintptr socketDescriptor)
     QMetaObject::invokeMethod(ssi, "initConnection", Qt::QueuedConnection, Q_ARG(int, socketDescriptor));
 }
 
-#if QT_VERSION < 0x050000
-void Servatrice_IslServer::incomingConnection(int socketDescriptor)
-#else
 void Servatrice_IslServer::incomingConnection(qintptr socketDescriptor)
-#endif
 {
     QThread *thread = new QThread;
     connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
@@ -317,16 +309,13 @@ bool Servatrice::initServer()
         if (!certFile.open(QIODevice::ReadOnly))
             throw QString("Error opening certificate file: %1").arg(certFileName);
         QSslCertificate cert(&certFile);
-#if QT_VERSION < 0x050000
-        if (!cert.isValid())
-            throw(QString("Invalid certificate."));
-#else
+
         const QDateTime currentTime = QDateTime::currentDateTime();
         if(currentTime < cert.effectiveDate() ||
             currentTime > cert.expiryDate() ||
             cert.isBlacklisted())
             throw(QString("Invalid certificate."));
-#endif
+
         qDebug() << "Loading private key...";
         QFile keyFile(keyFileName);
         if (!keyFile.open(QIODevice::ReadOnly))
diff --git a/servatrice/src/servatrice.h b/servatrice/src/servatrice.h
index e89cfdef..477cd459 100644
--- a/servatrice/src/servatrice.h
+++ b/servatrice/src/servatrice.h
@@ -53,11 +53,7 @@ public:
     Servatrice_GameServer(Servatrice *_server, int _numberPools, const QSqlDatabase &_sqlDatabase, QObject *parent = 0);
     ~Servatrice_GameServer();
 protected:
-#if QT_VERSION < 0x050000
-    void incomingConnection(int socketDescriptor);
-#else
     void incomingConnection(qintptr socketDescriptor);
-#endif
 };
 
 class Servatrice_IslServer : public QTcpServer {
@@ -70,11 +66,7 @@ public:
     Servatrice_IslServer(Servatrice *_server, const QSslCertificate &_cert, const QSslKey &_privateKey, QObject *parent = 0)
         : QTcpServer(parent), server(_server), cert(_cert), privateKey(_privateKey) { }
 protected:
-#if QT_VERSION < 0x050000
-    void incomingConnection(int socketDescriptor);
-#else
     void incomingConnection(qintptr socketDescriptor);
-#endif
 };
 
 class ServerProperties {
diff --git a/servatrice/src/settingscache.cpp b/servatrice/src/settingscache.cpp
index 1adad629..190be452 100644
--- a/servatrice/src/settingscache.cpp
+++ b/servatrice/src/settingscache.cpp
@@ -1,11 +1,7 @@
 #include "settingscache.h"
 #include <QCoreApplication>
 #include <QFile>
-#if QT_VERSION >= 0x050000
-    #include <QStandardPaths>
-#else
-    #include <QDesktopServices>
-#endif
+#include <QStandardPaths>
 
 SettingsCache::SettingsCache(const QString & fileName, QSettings::Format format, QObject * parent)
 :QSettings(fileName, format, parent)
@@ -36,10 +32,6 @@ QString SettingsCache::guessConfigurationPath(QString & specificPath)
         return guessFileName;
 #endif
 
-#if QT_VERSION >= 0x050000
     guessFileName =  QStandardPaths::writableLocation(QStandardPaths::DataLocation) + "/" + fileName;
-#else
-    guessFileName =  QDesktopServices::storageLocation(QDesktopServices::DataLocation) + "/" + fileName;
-#endif
     return guessFileName;
 }
diff --git a/servatrice/src/smtp/qxthmac.cpp b/servatrice/src/smtp/qxthmac.cpp
index 12c6ae74..0cbca1c5 100644
--- a/servatrice/src/smtp/qxthmac.cpp
+++ b/servatrice/src/smtp/qxthmac.cpp
@@ -26,9 +26,6 @@
 #include "qxthmac.h"
 #include <QtGlobal>
 
-#if QT_VERSION >= 0x040300
-
-
 /*
 \class QxtHmac
 
@@ -207,5 +204,3 @@ bool QxtHmac::verify(const QByteArray& key, const QByteArray& hmac, const QByteA
     d->ohash->addData(inner);
     return hmac == d->ohash->result();
 }
-
-#endif
diff --git a/servatrice/src/smtp/qxthmac.h b/servatrice/src/smtp/qxthmac.h
index 8e0d3d4a..e4d133b0 100644
--- a/servatrice/src/smtp/qxthmac.h
+++ b/servatrice/src/smtp/qxthmac.h
@@ -27,11 +27,6 @@
 #define QXTHMAC_H
 
 #include <QtGlobal>
-
-#if QT_VERSION < 0x040300
-#   warning QxtHmac requires Qt 4.3.0 or greater
-#else
-
 #include <QCryptographicHash>
 #include "qxtglobal.h"
 
@@ -61,4 +56,3 @@ private:
 };
 
 #endif
-#endif
diff --git a/tests/carddatabase/CMakeLists.txt b/tests/carddatabase/CMakeLists.txt
index 4f0e1e57..e1b48b7b 100644
--- a/tests/carddatabase/CMakeLists.txt
+++ b/tests/carddatabase/CMakeLists.txt
@@ -10,35 +10,22 @@ endif()
 target_link_libraries(carddatabase_test ${GTEST_BOTH_LIBRARIES})
 add_test(NAME carddatabase_test COMMAND carddatabase_test)
 
-# Qt4 stuff
-if(Qt4_FOUND)
-    SET(QT_USE_QTNETWORK TRUE)
-    SET(QT_USE_QTMULTIMEDIA TRUE)
+# qt5 stuff
+include_directories(${Qt5Widgets_INCLUDE_DIRS})
+list(APPEND COCKATRICE_LIBS Widgets)
 
-    # Include directories
-    INCLUDE(${QT_USE_FILE})
-    INCLUDE_DIRECTORIES(${QT_INCLUDES})
-    TARGET_LINK_LIBRARIES(carddatabase_test ${QT_LIBRARIES})
+# QtConcurrent
+find_package(Qt5Concurrent)
+if(Qt5Concurrent_FOUND)
+    include_directories(${Qt5Concurrent_INCLUDE_DIRS})
+    list(APPEND ORACLE_LIBS Concurrent)
 endif()
 
-# qt5 stuff
-if(Qt5Widgets_FOUND)
-    include_directories(${Qt5Widgets_INCLUDE_DIRS})
-    list(APPEND COCKATRICE_LIBS Widgets)
+# QtNetwork
+find_package(Qt5Network)
+if(Qt5Network_FOUND)
+    include_directories(${Qt5Network_INCLUDE_DIRS})
+    list(APPEND COCKATRICE_LIBS Network)
+endif()
 
-    # QtConcurrent
-    find_package(Qt5Concurrent)
-    if(Qt5Concurrent_FOUND)
-        include_directories(${Qt5Concurrent_INCLUDE_DIRS})
-        list(APPEND ORACLE_LIBS Concurrent)
-    endif()
-
-    # QtNetwork
-    find_package(Qt5Network)
-    if(Qt5Network_FOUND)
-        include_directories(${Qt5Network_INCLUDE_DIRS})
-        list(APPEND COCKATRICE_LIBS Network)
-    endif()
-
-    qt5_use_modules(carddatabase_test ${COCKATRICE_LIBS})
-endif()
\ No newline at end of file
+qt5_use_modules(carddatabase_test ${COCKATRICE_LIBS})
diff --git a/travis-compile.sh b/travis-compile.sh
index 0d26c5e4..f0d72ff8 100755
--- a/travis-compile.sh
+++ b/travis-compile.sh
@@ -7,19 +7,19 @@ set -e
 mkdir build
 cd build
 prefix=""
-if [[ $TRAVIS_OS_NAME == "osx" && $QT4 == 0 ]]; then
+if [[ $TRAVIS_OS_NAME == "osx" ]]; then
   prefix="-DCMAKE_PREFIX_PATH=$(echo /usr/local/Cellar/qt5/5.*/)"
 fi
-if [[ $TRAVIS_OS_NAME == "linux" && $QT4 == 0 ]]; then
+if [[ $TRAVIS_OS_NAME == "linux" ]]; then
   prefix="-DCMAKE_PREFIX_PATH=$(echo /opt/qt5*/lib/cmake/)"
   export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$(echo /opt/qt5*/lib/)"
 fi
 
 if [[ $BUILDTYPE == "Debug" ]]; then
-	cmake .. -DWITH_SERVER=1 -DTEST=1 -DCMAKE_BUILD_TYPE=$BUILDTYPE -DWITH_QT4=$QT4 $prefix
+	cmake .. -DWITH_SERVER=1 -DTEST=1 -DCMAKE_BUILD_TYPE=$BUILDTYPE $prefix
 	make -j2
 	make test
 else
-	cmake .. -DWITH_SERVER=1 -DCMAKE_BUILD_TYPE=$BUILDTYPE -DWITH_QT4=$QT4 $prefix
+	cmake .. -DWITH_SERVER=1 -DCMAKE_BUILD_TYPE=$BUILDTYPE $prefix
 	make package -j2
 fi
diff --git a/travis-dependencies.sh b/travis-dependencies.sh
index 4409885d..cd63a416 100755
--- a/travis-dependencies.sh
+++ b/travis-dependencies.sh
@@ -2,30 +2,20 @@
 
 if [[ $TRAVIS_OS_NAME == "osx" ]] ; then
   brew update > /dev/null
-  if (( QT4 )); then
-    brew install qt protobuf libgcrypt > /dev/null
-  else
-    brew install qt5 protobuf libgcrypt > /dev/null
-  fi
+  brew install qt5 protobuf > /dev/null
   brew unlink cmake
   brew upgrade cmake
-
 else
   # common prerequisites
   sudo add-apt-repository -y ppa:smspillaz/cmake-master
   sudo apt-get update -qq
   sudo apt-get -y purge cmake
-  sudo apt-get install -y libprotobuf-dev protobuf-compiler cmake bc
-
-  if (( QT4 )); then
-    # qt4 prerequisites
-    sudo apt-get install -y qtmobility-dev libqt4-dev
-  else
-    # qt5 prerequisites
-    sudo apt-get install -y libprotobuf-dev protobuf-compiler \
-      qt5-default qttools5-dev qttools5-dev-tools \
-      qtmultimedia5-dev libqt5multimedia5-plugins libqt5svg5-dev libqt5sql5-mysql
-  fi
+  sudo apt-get install -y \
+    libprotobuf-dev protobuf-compiler \
+    cmake \
+    bc \
+    qt5-default qttools5-dev qttools5-dev-tools \
+    qtmultimedia5-dev libqt5multimedia5-plugins libqt5svg5-dev libqt5sql5-mysql
 
   # prerequisites for tests
   if [[ $BUILDTYPE == "Debug" ]]; then
@@ -39,4 +29,4 @@ else
     sudo ln -s /usr/src/gtest/build/libgtest_main.so /usr/lib/libgtest_main.so
     cd -
   fi
-fi
+fi
\ No newline at end of file