diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 11ef262ea..5d5cbc893 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -52,13 +52,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-22.04
-            qt_ver: 5
-            qt_host: linux
-            qt_arch: ""
-            qt_version: "5.15.2"
-            qt_modules: "qtnetworkauth"
-
           - os: ubuntu-22.04
             qt_ver: 6
             qt_host: linux
@@ -254,7 +247,7 @@ jobs:
           arch: ${{ matrix.vcvars_arch }}
 
       - name: Prepare AppImage (Linux)
-        if: runner.os == 'Linux' && matrix.qt_ver != 5
+        if: runner.os == 'Linux'
         env:
           APPIMAGEUPDATE_HASH: ${{ matrix.appimageupdate_hash }}
           LINUXDEPLOY_HASH: ${{ matrix.linuxdeploy_hash }}
@@ -287,7 +280,7 @@ jobs:
       ##
 
       - name: Configure CMake (macOS)
-        if: runner.os == 'macOS' && matrix.qt_ver == 6
+        if: runner.os == 'macOS'
         run: |
           cmake -S . -B ${{ env.BUILD_DIR }} -DCMAKE_INSTALL_PREFIX=${{ env.INSTALL_DIR }} -DCMAKE_BUILD_TYPE=${{ inputs.build_type }} -DENABLE_LTO=ON -DLauncher_ENABLE_JAVA_DOWNLOADER=ON -DLauncher_BUILD_PLATFORM=official -DCMAKE_C_COMPILER_LAUNCHER=${{ env.CCACHE_VAR }} -DCMAKE_CXX_COMPILER_LAUNCHER=${{ env.CCACHE_VAR }} -DLauncher_QT_VERSION_MAJOR=${{ matrix.qt_ver }} -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" -G Ninja
 
@@ -502,7 +495,7 @@ jobs:
           }
 
       - name: Package AppImage (Linux)
-        if: runner.os == 'Linux' && matrix.qt_ver != 5
+        if: runner.os == 'Linux'
         shell: bash
         env:
           GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
@@ -598,29 +591,22 @@ jobs:
           name: PrismLauncher-${{ matrix.name }}-Setup-${{ env.VERSION }}-${{ inputs.build_type }}
           path: PrismLauncher-Setup.exe
 
-      - name: Upload binary tarball (Linux, portable, Qt 5)
-        if: runner.os == 'Linux' && matrix.qt_ver != 6
-        uses: actions/upload-artifact@v4
-        with:
-          name: PrismLauncher-${{ runner.os }}-Qt5-Portable-${{ env.VERSION }}-${{ inputs.build_type }}
-          path: PrismLauncher-portable.tar.gz
-
-      - name: Upload binary tarball (Linux, portable, Qt 6)
-        if: runner.os == 'Linux' && matrix.qt_ver != 5
+      - name: Upload binary tarball (Linux, portable)
+        if: runner.os == 'Linux'
         uses: actions/upload-artifact@v4
         with:
           name: PrismLauncher-${{ runner.os }}-Qt6-Portable-${{ env.VERSION }}-${{ inputs.build_type }}
           path: PrismLauncher-portable.tar.gz
 
       - name: Upload AppImage (Linux)
-        if: runner.os == 'Linux' && matrix.qt_ver != 5
+        if: runner.os == 'Linux'
         uses: actions/upload-artifact@v4
         with:
           name: PrismLauncher-${{ runner.os }}-${{ env.VERSION }}-${{ inputs.build_type }}-x86_64.AppImage
           path: PrismLauncher-${{ runner.os }}-${{ env.VERSION }}-${{ inputs.build_type }}-x86_64.AppImage
 
       - name: Upload AppImage Zsync (Linux)
-        if: runner.os == 'Linux' && matrix.qt_ver != 5
+        if: runner.os == 'Linux'
         uses: actions/upload-artifact@v4
         with:
           name: PrismLauncher-${{ runner.os }}-${{ env.VERSION }}-${{ inputs.build_type }}-x86_64.AppImage.zsync
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index d1d810374..e3243097d 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -1,16 +1,16 @@
 name: "CodeQL Code Scanning"
 
-on: [ push, pull_request, workflow_dispatch ]
+on: [push, pull_request, workflow_dispatch]
 
 jobs:
   CodeQL:
     runs-on: ubuntu-latest
-    
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
-          submodules: 'true'
+          submodules: "true"
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3
@@ -20,14 +20,25 @@ jobs:
           languages: cpp, java
 
       - name: Install Dependencies
-        run:  
-          sudo apt-get -y update
+        run: sudo apt-get -y update
 
-          sudo apt-get -y install ninja-build extra-cmake-modules scdoc qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools libqt5core5a libqt5network5 libqt5gui5 libqt5networkauth5 libqt5networkauth5-dev libqt5opengl5 libqt5opengl5-dev
+          sudo apt-get -y install ninja-build extra-cmake-modules scdoc
+
+      - name: Install Qt
+        uses: jurplel/install-qt-action@v3
+        with:
+          aqtversion: "==3.1.*"
+          py7zrversion: ">=0.20.2"
+          version: "6.8.1"
+          host: "linux"
+          target: "desktop"
+          arch: ""
+          modules: "qt5compat qtimageformats qtnetworkauth"
+          tools: ""
 
       - name: Configure and Build
         run: |
-          cmake -S . -B build -DCMAKE_INSTALL_PREFIX=/usr -DLauncher_QT_VERSION_MAJOR=5 -G Ninja
+          cmake -S . -B build -DCMAKE_INSTALL_PREFIX=/usr -G Ninja
 
           cmake --build build
 
diff --git a/.github/workflows/trigger_release.yml b/.github/workflows/trigger_release.yml
index 411a5bbeb..96f616a43 100644
--- a/.github/workflows/trigger_release.yml
+++ b/.github/workflows/trigger_release.yml
@@ -46,7 +46,6 @@ jobs:
         run: |
           mv ${{ github.workspace }}/PrismLauncher-source PrismLauncher-${{ env.VERSION }}
           mv PrismLauncher-Linux-Qt6-Portable*/PrismLauncher-portable.tar.gz PrismLauncher-Linux-Qt6-Portable-${{ env.VERSION }}.tar.gz
-          mv PrismLauncher-Linux-Qt5-Portable*/PrismLauncher-portable.tar.gz PrismLauncher-Linux-Qt5-Portable-${{ env.VERSION }}.tar.gz
           mv PrismLauncher-*.AppImage/PrismLauncher-*.AppImage PrismLauncher-Linux-x86_64.AppImage
           mv PrismLauncher-*.AppImage.zsync/PrismLauncher-*.AppImage.zsync PrismLauncher-Linux-x86_64.AppImage.zsync
           mv PrismLauncher-macOS*/PrismLauncher.zip PrismLauncher-macOS-${{ env.VERSION }}.zip
@@ -89,7 +88,6 @@ jobs:
           draft: true
           prerelease: false
           files: |
-            PrismLauncher-Linux-Qt5-Portable-${{ env.VERSION }}.tar.gz
             PrismLauncher-Linux-x86_64.AppImage
             PrismLauncher-Linux-x86_64.AppImage.zsync
             PrismLauncher-Linux-Qt6-Portable-${{ env.VERSION }}.tar.gz
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 91e10daf7..68d900c27 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -88,10 +88,8 @@ else()
     endif()
 endif()
 
-# Fix build with Qt 5.13
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DQT_NO_DEPRECATED_WARNINGS=Y")
-
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DQT_DISABLE_DEPRECATED_BEFORE=0x050C00")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DQT_WARN_DEPRECATED_UP_TO=0x060200")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DQT_DISABLE_DEPRECATED_UP_TO=0x060000")
 
 # Fix aarch64 build for toml++
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DTOML_ENABLE_FLOAT16=0")
@@ -310,23 +308,7 @@ endif()
 
 # Find the required Qt parts
 include(QtVersionlessBackport)
-if(Launcher_QT_VERSION_MAJOR EQUAL 5)
-    set(QT_VERSION_MAJOR 5)
-    find_package(Qt5 REQUIRED COMPONENTS Core Widgets Concurrent Network Test Xml NetworkAuth OpenGL)
-    find_package(Qt5 COMPONENTS DBus)
-    list(APPEND Launcher_QT_DBUS Qt5::DBus)
-
-    if(NOT Launcher_FORCE_BUNDLED_LIBS)
-        find_package(QuaZip-Qt5 1.3 QUIET)
-    endif()
-    if (NOT QuaZip-Qt5_FOUND)
-        set(QUAZIP_QT_MAJOR_VERSION ${QT_VERSION_MAJOR} CACHE STRING "Qt version to use (4, 5 or 6), defaults to ${QT_VERSION_MAJOR}" FORCE)
-        set(FORCE_BUNDLED_QUAZIP 1)
-    endif()
-
-    # Qt 6 sets these by default. Notably causes Windows APIs to use UNICODE strings.
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DUNICODE -D_UNICODE")
-elseif(Launcher_QT_VERSION_MAJOR EQUAL 6)
+if(Launcher_QT_VERSION_MAJOR EQUAL 6)
     set(QT_VERSION_MAJOR 6)
     find_package(Qt6 REQUIRED COMPONENTS Core CoreTools Widgets Concurrent Network Test Xml Core5Compat NetworkAuth OpenGL)
     find_package(Qt6 COMPONENTS DBus)
@@ -344,22 +326,12 @@ else()
     message(FATAL_ERROR "Qt version ${Launcher_QT_VERSION_MAJOR} is not supported")
 endif()
 
-if(Launcher_QT_VERSION_MAJOR EQUAL 5)
-    include(ECMQueryQt)
-    ecm_query_qt(QT_PLUGINS_DIR  QT_INSTALL_PLUGINS)
-    ecm_query_qt(QT_LIBS_DIR     QT_INSTALL_LIBS)
-    ecm_query_qt(QT_LIBEXECS_DIR QT_INSTALL_LIBEXECS)
-else()
+if(Launcher_QT_VERSION_MAJOR EQUAL 6)
     set(QT_PLUGINS_DIR  ${QT${QT_VERSION_MAJOR}_INSTALL_PREFIX}/${QT${QT_VERSION_MAJOR}_INSTALL_PLUGINS})
     set(QT_LIBS_DIR     ${QT${QT_VERSION_MAJOR}_INSTALL_PREFIX}/${QT${QT_VERSION_MAJOR}_INSTALL_LIBS})
     set(QT_LIBEXECS_DIR ${QT${QT_VERSION_MAJOR}_INSTALL_PREFIX}/${QT${QT_VERSION_MAJOR}_INSTALL_LIBEXECS})
 endif()
 
-# NOTE: Qt 6 already sets this by default
-if (Qt5_POSITION_INDEPENDENT_CODE)
-    SET(CMAKE_POSITION_INDEPENDENT_CODE ON)
-endif()
-
 if(NOT Launcher_FORCE_BUNDLED_LIBS)
     # Find toml++
     find_package(tomlplusplus 3.2.0 QUIET)
diff --git a/COPYING.md b/COPYING.md
index f742c0132..1ebde116f 100644
--- a/COPYING.md
+++ b/COPYING.md
@@ -108,7 +108,7 @@
 
     Information on third party licenses used in MinGW-w64 can be found in its COPYING.MinGW-w64-runtime.txt.
 
-## Qt 5/6
+## Qt 6
 
     Copyright (C) 2022 The Qt Company Ltd and other contributors.
     Contact: https://www.qt.io/licensing
diff --git a/launcher/DataMigrationTask.cpp b/launcher/DataMigrationTask.cpp
index 92e310a16..18decc7c3 100644
--- a/launcher/DataMigrationTask.cpp
+++ b/launcher/DataMigrationTask.cpp
@@ -37,11 +37,7 @@ void DataMigrationTask::dryRunFinished()
     disconnect(&m_copyFutureWatcher, &QFutureWatcher<bool>::finished, this, &DataMigrationTask::dryRunFinished);
     disconnect(&m_copyFutureWatcher, &QFutureWatcher<bool>::canceled, this, &DataMigrationTask::dryRunAborted);
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     if (!m_copyFuture.isValid() || !m_copyFuture.result()) {
-#else
-    if (!m_copyFuture.result()) {
-#endif
         emitFailed(tr("Failed to scan source path."));
         return;
     }
@@ -75,11 +71,7 @@ void DataMigrationTask::copyFinished()
     disconnect(&m_copyFutureWatcher, &QFutureWatcher<bool>::finished, this, &DataMigrationTask::copyFinished);
     disconnect(&m_copyFutureWatcher, &QFutureWatcher<bool>::canceled, this, &DataMigrationTask::copyAborted);
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     if (!m_copyFuture.isValid() || !m_copyFuture.result()) {
-#else
-    if (!m_copyFuture.result()) {
-#endif
         emitFailed(tr("Some paths could not be copied!"));
         return;
     }
diff --git a/launcher/FileIgnoreProxy.cpp b/launcher/FileIgnoreProxy.cpp
index 89c91ec1d..0314057d1 100644
--- a/launcher/FileIgnoreProxy.cpp
+++ b/launcher/FileIgnoreProxy.cpp
@@ -282,11 +282,7 @@ void FileIgnoreProxy::loadBlockedPathsFromFile(const QString& fileName)
     }
     auto ignoreData = ignoreFile.readAll();
     auto string = QString::fromUtf8(ignoreData);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
     setBlockedPaths(string.split('\n', Qt::SkipEmptyParts));
-#else
-    setBlockedPaths(string.split('\n', QString::SkipEmptyParts));
-#endif
 }
 
 void FileIgnoreProxy::saveBlockedPathsToFile(const QString& fileName)
diff --git a/launcher/FileSystem.cpp b/launcher/FileSystem.cpp
index 7189ca841..08dc7d2cc 100644
--- a/launcher/FileSystem.cpp
+++ b/launcher/FileSystem.cpp
@@ -679,9 +679,6 @@ bool deletePath(QString path)
 
 bool trash(QString path, QString* pathInTrash)
 {
-#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
-    return false;
-#else
     // FIXME: Figure out trash in Flatpak. Qt seemingly doesn't use the Trash portal
     if (DesktopServices::isFlatpak())
         return false;
@@ -690,7 +687,6 @@ bool trash(QString path, QString* pathInTrash)
         return false;
 #endif
     return QFile::moveToTrash(path, pathInTrash);
-#endif
 }
 
 QString PathCombine(const QString& path1, const QString& path2)
@@ -724,11 +720,7 @@ int pathDepth(const QString& path)
 
     QFileInfo info(path);
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
-    auto parts = QDir::toNativeSeparators(info.path()).split(QDir::separator(), QString::SkipEmptyParts);
-#else
     auto parts = QDir::toNativeSeparators(info.path()).split(QDir::separator(), Qt::SkipEmptyParts);
-#endif
 
     int numParts = parts.length();
     numParts -= parts.count(".");
@@ -748,11 +740,7 @@ QString pathTruncate(const QString& path, int depth)
         return pathTruncate(trunc, depth);
     }
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
-    auto parts = QDir::toNativeSeparators(trunc).split(QDir::separator(), QString::SkipEmptyParts);
-#else
     auto parts = QDir::toNativeSeparators(trunc).split(QDir::separator(), Qt::SkipEmptyParts);
-#endif
 
     if (parts.startsWith(".") && !path.startsWith(".")) {
         parts.removeFirst();
diff --git a/launcher/InstanceList.cpp b/launcher/InstanceList.cpp
index 918fa1073..f76f8599a 100644
--- a/launcher/InstanceList.cpp
+++ b/launcher/InstanceList.cpp
@@ -449,11 +449,7 @@ QList<InstanceId> InstanceList::discoverInstances()
         out.append(id);
         qDebug() << "Found instance ID" << id;
     }
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
     instanceSet = QSet<QString>(out.begin(), out.end());
-#else
-    instanceSet = out.toSet();
-#endif
     m_instancesProbed = true;
     return out;
 }
diff --git a/launcher/StringUtils.cpp b/launcher/StringUtils.cpp
index edda9f247..2ea67762e 100644
--- a/launcher/StringUtils.cpp
+++ b/launcher/StringUtils.cpp
@@ -53,7 +53,7 @@ static inline QChar getNextChar(const QString& s, int location)
 int StringUtils::naturalCompare(const QString& s1, const QString& s2, Qt::CaseSensitivity cs)
 {
     int l1 = 0, l2 = 0;
-    while (l1 <= s1.count() && l2 <= s2.count()) {
+    while (l1 <= s1.size() && l2 <= s2.size()) {
         // skip spaces, tabs and 0's
         QChar c1 = getNextChar(s1, l1);
         while (c1.isSpace())
diff --git a/launcher/Version.h b/launcher/Version.h
index b06e256aa..12e7f0832 100644
--- a/launcher/Version.h
+++ b/launcher/Version.h
@@ -72,22 +72,14 @@ class Version {
                 }
             }
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
             auto numPart = QStringView{ m_fullString }.left(cutoff);
-#else
-            auto numPart = m_fullString.leftRef(cutoff);
-#endif
 
             if (!numPart.isEmpty()) {
                 m_isNull = false;
                 m_numPart = numPart.toInt();
             }
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
             auto stringPart = QStringView{ m_fullString }.mid(cutoff);
-#else
-            auto stringPart = m_fullString.midRef(cutoff);
-#endif
 
             if (!stringPart.isEmpty()) {
                 m_isNull = false;
diff --git a/launcher/icons/IconList.cpp b/launcher/icons/IconList.cpp
index 7369d8b4b..8a2a482e1 100644
--- a/launcher/icons/IconList.cpp
+++ b/launcher/icons/IconList.cpp
@@ -137,11 +137,7 @@ QString formatName(const QDir& iconsDir, const QFileInfo& iconFile)
 /// Split into a separate function because the preprocessing impedes readability
 QSet<QString> toStringSet(const QList<QString>& list)
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
     QSet<QString> set(list.begin(), list.end());
-#else
-    QSet<QString> set = list.toSet();
-#endif
     return set;
 }
 
@@ -477,4 +473,4 @@ QString IconList::iconDirectory(const QString& key) const
         }
     }
     return getDirectory();
-}
+}
\ No newline at end of file
diff --git a/launcher/java/JavaChecker.cpp b/launcher/java/JavaChecker.cpp
index 07b5d7b40..0aa725705 100644
--- a/launcher/java/JavaChecker.cpp
+++ b/launcher/java/JavaChecker.cpp
@@ -137,11 +137,7 @@ void JavaChecker::finished(int exitcode, QProcess::ExitStatus status)
 
     QMap<QString, QString> results;
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
     QStringList lines = m_stdout.split("\n", Qt::SkipEmptyParts);
-#else
-    QStringList lines = m_stdout.split("\n", QString::SkipEmptyParts);
-#endif
     for (QString line : lines) {
         line = line.trimmed();
         // NOTE: workaround for GH-4125, where garbage is getting printed into stdout on bedrock linux
@@ -149,11 +145,7 @@ void JavaChecker::finished(int exitcode, QProcess::ExitStatus status)
             continue;
         }
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
         auto parts = line.split('=', Qt::SkipEmptyParts);
-#else
-        auto parts = line.split('=', QString::SkipEmptyParts);
-#endif
         if (parts.size() != 2 || parts[0].isEmpty() || parts[1].isEmpty()) {
             continue;
         } else {
diff --git a/launcher/launch/steps/PostLaunchCommand.cpp b/launcher/launch/steps/PostLaunchCommand.cpp
index 5d893c71f..6b960974e 100644
--- a/launcher/launch/steps/PostLaunchCommand.cpp
+++ b/launcher/launch/steps/PostLaunchCommand.cpp
@@ -49,14 +49,10 @@ void PostLaunchCommand::executeTask()
 {
     auto cmd = m_parent->substituteVariables(m_command);
     emit logLine(tr("Running Post-Launch command: %1").arg(cmd), MessageLevel::Launcher);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
     auto args = QProcess::splitCommand(cmd);
 
     const QString program = args.takeFirst();
     m_process.start(program, args);
-#else
-    m_process.start(cmd);
-#endif
 }
 
 void PostLaunchCommand::on_state(LoggedProcess::State state)
diff --git a/launcher/launch/steps/PreLaunchCommand.cpp b/launcher/launch/steps/PreLaunchCommand.cpp
index 318237e99..7e843ca3f 100644
--- a/launcher/launch/steps/PreLaunchCommand.cpp
+++ b/launcher/launch/steps/PreLaunchCommand.cpp
@@ -49,13 +49,9 @@ void PreLaunchCommand::executeTask()
 {
     auto cmd = m_parent->substituteVariables(m_command);
     emit logLine(tr("Running Pre-Launch command: %1").arg(cmd), MessageLevel::Launcher);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
     auto args = QProcess::splitCommand(cmd);
     const QString program = args.takeFirst();
     m_process.start(program, args);
-#else
-    m_process.start(cmd);
-#endif
 }
 
 void PreLaunchCommand::on_state(LoggedProcess::State state)
diff --git a/launcher/minecraft/MinecraftInstance.cpp b/launcher/minecraft/MinecraftInstance.cpp
index 6f367a1bd..ec136ede0 100644
--- a/launcher/minecraft/MinecraftInstance.cpp
+++ b/launcher/minecraft/MinecraftInstance.cpp
@@ -757,11 +757,7 @@ QStringList MinecraftInstance::processMinecraftArgs(AuthSessionPtr session, Mine
     token_mapping["assets_root"] = absAssetsDir;
     token_mapping["assets_index_name"] = assets->id;
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
     QStringList parts = args_pattern.split(' ', Qt::SkipEmptyParts);
-#else
-    QStringList parts = args_pattern.split(' ', QString::SkipEmptyParts);
-#endif
     for (int i = 0; i < parts.length(); i++) {
         parts[i] = replaceTokensIn(parts[i], token_mapping);
     }
@@ -816,11 +812,7 @@ QString MinecraftInstance::createLaunchScript(AuthSessionPtr session, MinecraftT
                     auto mainWindow = qobject_cast<QMainWindow*>(w);
                     if (mainWindow) {
                         auto m = mainWindow->windowHandle()->frameMargins();
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
                         screenGeometry = screenGeometry.shrunkBy(m);
-#else
-                        screenGeometry = { screenGeometry.width() - m.left() - m.right(), screenGeometry.height() - m.top() - m.bottom() };
-#endif
                         break;
                     }
                 }
diff --git a/launcher/minecraft/PackProfile.cpp b/launcher/minecraft/PackProfile.cpp
index 4deee9712..8475a1f32 100644
--- a/launcher/minecraft/PackProfile.cpp
+++ b/launcher/minecraft/PackProfile.cpp
@@ -645,11 +645,7 @@ void PackProfile::move(const int index, const MoveDirection direction)
         return;
     }
     beginMoveRows(QModelIndex(), index, index, QModelIndex(), togap);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 13, 0)
     d->components.swapItemsAt(index, theirIndex);
-#else
-    d->components.swap(index, theirIndex);
-#endif
     endMoveRows();
     invalidateLaunchProfile();
     scheduleSave();
diff --git a/launcher/minecraft/WorldList.cpp b/launcher/minecraft/WorldList.cpp
index 5f192740e..6a821ba60 100644
--- a/launcher/minecraft/WorldList.cpp
+++ b/launcher/minecraft/WorldList.cpp
@@ -309,11 +309,7 @@ class WorldMimeData : public QMimeData {
     QStringList formats() const { return QMimeData::formats() << "text/uri-list"; }
 
    protected:
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     QVariant retrieveData(const QString& mimetype, QMetaType type) const
-#else
-    QVariant retrieveData(const QString& mimetype, QVariant::Type type) const
-#endif
     {
         QList<QUrl> urls;
         for (auto& world : m_worlds) {
diff --git a/launcher/minecraft/auth/MinecraftAccount.cpp b/launcher/minecraft/auth/MinecraftAccount.cpp
index 1ed39b5ca..1613a42b1 100644
--- a/launcher/minecraft/auth/MinecraftAccount.cpp
+++ b/launcher/minecraft/auth/MinecraftAccount.cpp
@@ -106,11 +106,7 @@ QPixmap MinecraftAccount::getFace() const
         return QPixmap();
     }
     QPixmap skin = QPixmap(8, 8);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
     skin.fill(QColorConstants::Transparent);
-#else
-    skin.fill(QColor(0, 0, 0, 0));
-#endif
     QPainter painter(&skin);
     painter.drawPixmap(0, 0, skinTexture.copy(8, 8, 8, 8));
     painter.drawPixmap(0, 0, skinTexture.copy(40, 8, 8, 8));
@@ -290,13 +286,8 @@ QUuid MinecraftAccount::uuidFromUsername(QString username)
     // basically a reimplementation of Java's UUID#nameUUIDFromBytes
     QByteArray digest = QCryptographicHash::hash(input, QCryptographicHash::Md5);
 
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    auto bOr = [](QByteArray& array, int index, char value) { array[index] = array.at(index) | value; };
-    auto bAnd = [](QByteArray& array, int index, char value) { array[index] = array.at(index) & value; };
-#else
     auto bOr = [](QByteArray& array, qsizetype index, char value) { array[index] |= value; };
     auto bAnd = [](QByteArray& array, qsizetype index, char value) { array[index] &= value; };
-#endif
     bAnd(digest, 6, (char)0x0f);  // clear version
     bOr(digest, 6, (char)0x30);   // set to version 3
     bAnd(digest, 8, (char)0x3f);  // clear variant
diff --git a/launcher/minecraft/auth/Parsers.cpp b/launcher/minecraft/auth/Parsers.cpp
index f9d89baa2..de1ffda86 100644
--- a/launcher/minecraft/auth/Parsers.cpp
+++ b/launcher/minecraft/auth/Parsers.cpp
@@ -315,11 +315,7 @@ bool parseMinecraftProfileMojang(QByteArray& data, MinecraftProfile& output)
 
         auto value = pObj.value("value");
         if (value.isString()) {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
             texturePayload = QByteArray::fromBase64(value.toString().toUtf8(), QByteArray::AbortOnBase64DecodingErrors);
-#else
-            texturePayload = QByteArray::fromBase64(value.toString().toUtf8());
-#endif
         }
 
         if (!texturePayload.isEmpty()) {
diff --git a/launcher/minecraft/auth/steps/MSAStep.cpp b/launcher/minecraft/auth/steps/MSAStep.cpp
index 87a0f8f08..aa972be71 100644
--- a/launcher/minecraft/auth/steps/MSAStep.cpp
+++ b/launcher/minecraft/auth/steps/MSAStep.cpp
@@ -168,13 +168,8 @@ void MSAStep::perform()
         m_oauth2.setRefreshToken(m_data->msaToken.refresh_token);
         m_oauth2.refreshAccessToken();
     } else {
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)  // QMultiMap param changed in 6.0
         m_oauth2.setModifyParametersFunction(
             [](QAbstractOAuth::Stage stage, QMultiMap<QString, QVariant>* map) { map->insert("prompt", "select_account"); });
-#else
-        m_oauth2.setModifyParametersFunction(
-            [](QAbstractOAuth::Stage stage, QMap<QString, QVariant>* map) { map->insert("prompt", "select_account"); });
-#endif
 
         *m_data = AccountData();
         m_data->msaClientID = m_clientId;
@@ -182,4 +177,4 @@ void MSAStep::perform()
     }
 }
 
-#include "MSAStep.moc"
\ No newline at end of file
+#include "MSAStep.moc"
diff --git a/launcher/minecraft/mod/ResourceFolderModel.cpp b/launcher/minecraft/mod/ResourceFolderModel.cpp
index 5f4748b92..bf40c81d7 100644
--- a/launcher/minecraft/mod/ResourceFolderModel.cpp
+++ b/launcher/minecraft/mod/ResourceFolderModel.cpp
@@ -363,16 +363,11 @@ void ResourceFolderModel::onUpdateSucceeded()
 
     auto& new_resources = update_results->resources;
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
     auto current_list = m_resources_index.keys();
     QSet<QString> current_set(current_list.begin(), current_list.end());
 
     auto new_list = new_resources.keys();
     QSet<QString> new_set(new_list.begin(), new_list.end());
-#else
-    QSet<QString> current_set(m_resources_index.keys().toSet());
-    QSet<QString> new_set(new_resources.keys().toSet());
-#endif
 
     applyUpdates(current_set, new_set, new_resources);
 }
diff --git a/launcher/modplatform/atlauncher/ATLPackInstallTask.cpp b/launcher/modplatform/atlauncher/ATLPackInstallTask.cpp
index a0898edbd..a9706a768 100644
--- a/launcher/modplatform/atlauncher/ATLPackInstallTask.cpp
+++ b/launcher/modplatform/atlauncher/ATLPackInstallTask.cpp
@@ -678,13 +678,8 @@ void PackInstallTask::extractConfigs()
         return;
     }
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     m_extractFuture = QtConcurrent::run(QThreadPool::globalInstance(), QOverload<QString, QString>::of(MMCZip::extractDir), archivePath,
                                         extractDir.absolutePath() + "/minecraft");
-#else
-    m_extractFuture =
-        QtConcurrent::run(QThreadPool::globalInstance(), MMCZip::extractDir, archivePath, extractDir.absolutePath() + "/minecraft");
-#endif
     connect(&m_extractFutureWatcher, &QFutureWatcher<QStringList>::finished, this, [this]() { downloadMods(); });
     connect(&m_extractFutureWatcher, &QFutureWatcher<QStringList>::canceled, this, [this]() { emitAborted(); });
     m_extractFutureWatcher.setFuture(m_extractFuture);
@@ -897,13 +892,8 @@ void PackInstallTask::onModsDownloaded()
     jobPtr.reset();
 
     if (!modsToExtract.empty() || !modsToDecomp.empty() || !modsToCopy.empty()) {
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
         m_modExtractFuture =
             QtConcurrent::run(QThreadPool::globalInstance(), &PackInstallTask::extractMods, this, modsToExtract, modsToDecomp, modsToCopy);
-#else
-        m_modExtractFuture =
-            QtConcurrent::run(QThreadPool::globalInstance(), this, &PackInstallTask::extractMods, modsToExtract, modsToDecomp, modsToCopy);
-#endif
         connect(&m_modExtractFutureWatcher, &QFutureWatcher<QStringList>::finished, this, &PackInstallTask::onModsExtracted);
         connect(&m_modExtractFutureWatcher, &QFutureWatcher<QStringList>::canceled, this, &PackInstallTask::emitAborted);
         m_modExtractFutureWatcher.setFuture(m_modExtractFuture);
diff --git a/launcher/modplatform/legacy_ftb/PackFetchTask.cpp b/launcher/modplatform/legacy_ftb/PackFetchTask.cpp
index a0beeddcc..aea9cefad 100644
--- a/launcher/modplatform/legacy_ftb/PackFetchTask.cpp
+++ b/launcher/modplatform/legacy_ftb/PackFetchTask.cpp
@@ -79,7 +79,7 @@ void PackFetchTask::fetchPrivate(const QStringList& toFetch)
         QObject::connect(job, &NetJob::succeeded, this, [this, job, data, packCode] {
             ModpackList packs;
             parseAndAddPacks(*data, PackType::Private, packs);
-            foreach (Modpack currentPack, packs) {
+            for (auto& currentPack : packs) {
                 currentPack.packCode = packCode;
                 emit privateFileDownloadFinished(currentPack);
             }
diff --git a/launcher/modplatform/legacy_ftb/PackInstallTask.cpp b/launcher/modplatform/legacy_ftb/PackInstallTask.cpp
index c04c0b2f3..2b9bd127a 100644
--- a/launcher/modplatform/legacy_ftb/PackInstallTask.cpp
+++ b/launcher/modplatform/legacy_ftb/PackInstallTask.cpp
@@ -108,13 +108,8 @@ void PackInstallTask::unzip()
         return;
     }
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     m_extractFuture = QtConcurrent::run(QThreadPool::globalInstance(), QOverload<QString, QString>::of(MMCZip::extractDir), archivePath,
                                         extractDir.absolutePath() + "/unzip");
-#else
-    m_extractFuture =
-        QtConcurrent::run(QThreadPool::globalInstance(), MMCZip::extractDir, archivePath, extractDir.absolutePath() + "/unzip");
-#endif
     connect(&m_extractFutureWatcher, &QFutureWatcher<QStringList>::finished, this, &PackInstallTask::onUnzipFinished);
     connect(&m_extractFutureWatcher, &QFutureWatcher<QStringList>::canceled, this, &PackInstallTask::onUnzipCanceled);
     m_extractFutureWatcher.setFuture(m_extractFuture);
@@ -165,7 +160,7 @@ void PackInstallTask::install()
         // we only care about the libs
         QJsonArray libs = doc.object().value("libraries").toArray();
 
-        foreach (const QJsonValue& value, libs) {
+        for (const auto& value : libs) {
             QString nameValue = value.toObject().value("name").toString();
             if (!nameValue.startsWith("net.minecraftforge")) {
                 continue;
diff --git a/launcher/modplatform/legacy_ftb/PrivatePackManager.cpp b/launcher/modplatform/legacy_ftb/PrivatePackManager.cpp
index 2ae351329..17e9f7d76 100644
--- a/launcher/modplatform/legacy_ftb/PrivatePackManager.cpp
+++ b/launcher/modplatform/legacy_ftb/PrivatePackManager.cpp
@@ -44,12 +44,8 @@ namespace LegacyFTB {
 void PrivatePackManager::load()
 {
     try {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
         auto foo = QString::fromUtf8(FS::read(m_filename)).split('\n', Qt::SkipEmptyParts);
         currentPacks = QSet<QString>(foo.begin(), foo.end());
-#else
-        currentPacks = QString::fromUtf8(FS::read(m_filename)).split('\n', QString::SkipEmptyParts).toSet();
-#endif
 
         dirty = false;
     } catch (...) {
diff --git a/launcher/net/NetRequest.cpp b/launcher/net/NetRequest.cpp
index 310653508..ef533f599 100644
--- a/launcher/net/NetRequest.cpp
+++ b/launcher/net/NetRequest.cpp
@@ -104,12 +104,10 @@ void NetRequest::executeTask()
         header_proxy->writeHeaders(request);
     }
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
 #if defined(LAUNCHER_APPLICATION)
     request.setTransferTimeout(APPLICATION->settings()->get("RequestTimeout").toInt() * 1000);
 #else
     request.setTransferTimeout();
-#endif
 #endif
 
     m_last_progress_time = m_clock.now();
@@ -122,11 +120,7 @@ void NetRequest::executeTask()
     connect(rep, &QNetworkReply::uploadProgress, this, &NetRequest::onProgress);
     connect(rep, &QNetworkReply::downloadProgress, this, &NetRequest::onProgress);
     connect(rep, &QNetworkReply::finished, this, &NetRequest::downloadFinished);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)  // QNetworkReply::errorOccurred added in 5.15
     connect(rep, &QNetworkReply::errorOccurred, this, &NetRequest::downloadError);
-#else
-    connect(rep, QOverload<QNetworkReply::NetworkError>::of(&QNetworkReply::error), this, &NetRequest::downloadError);
-#endif
     connect(rep, &QNetworkReply::sslErrors, this, &NetRequest::sslErrors);
     connect(rep, &QNetworkReply::readyRead, this, &NetRequest::downloadReadyRead);
 }
@@ -323,11 +317,7 @@ auto NetRequest::abort() -> bool
 {
     m_state = State::AbortedByUser;
     if (m_reply) {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)  // QNetworkReply::errorOccurred added in 5.15
         disconnect(m_reply.get(), &QNetworkReply::errorOccurred, nullptr, nullptr);
-#else
-        disconnect(m_reply.get(), QOverload<QNetworkReply::NetworkError>::of(&QNetworkReply::error), nullptr, nullptr);
-#endif
         m_reply->abort();
     }
     return true;
diff --git a/launcher/net/PasteUpload.cpp b/launcher/net/PasteUpload.cpp
index c67d3b23c..86a44669e 100644
--- a/launcher/net/PasteUpload.cpp
+++ b/launcher/net/PasteUpload.cpp
@@ -130,11 +130,7 @@ void PasteUpload::executeTask()
     connect(rep, &QNetworkReply::uploadProgress, this, &Task::setProgress);
     connect(rep, &QNetworkReply::finished, this, &PasteUpload::downloadFinished);
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
     connect(rep, &QNetworkReply::errorOccurred, this, &PasteUpload::downloadError);
-#else
-    connect(rep, QOverload<QNetworkReply::NetworkError>::of(&QNetworkReply::error), this, &PasteUpload::downloadError);
-#endif
 
     m_reply = std::shared_ptr<QNetworkReply>(rep);
 
diff --git a/launcher/translations/TranslationsModel.cpp b/launcher/translations/TranslationsModel.cpp
index 429ead47d..e863dfef4 100644
--- a/launcher/translations/TranslationsModel.cpp
+++ b/launcher/translations/TranslationsModel.cpp
@@ -480,7 +480,7 @@ bool TranslationsModel::selectLanguage(QString key)
     bool successful = false;
     // FIXME: this is likely never present. FIX IT.
     d->m_qt_translator.reset(new QTranslator());
-    if (d->m_qt_translator->load("qt_" + langCode, QLibraryInfo::location(QLibraryInfo::TranslationsPath))) {
+    if (d->m_qt_translator->load("qt_" + langCode, QLibraryInfo::path(QLibraryInfo::TranslationsPath))) {
         qDebug() << "Loading Qt Language File for" << langCode.toLocal8Bit().constData() << "...";
         if (!QCoreApplication::installTranslator(d->m_qt_translator.get())) {
             qCritical() << "Loading Qt Language File failed.";
diff --git a/launcher/ui/MainWindow.cpp b/launcher/ui/MainWindow.cpp
index d8716b3ea..d190c6a02 100644
--- a/launcher/ui/MainWindow.cpp
+++ b/launcher/ui/MainWindow.cpp
@@ -721,7 +721,7 @@ void MainWindow::changeActiveAccount()
     QAction* sAction = (QAction*)sender();
 
     // Profile's associated Mojang username
-    if (sAction->data().type() != QVariant::Type::Int)
+    if (sAction->data().typeId() != QMetaType::Int)
         return;
 
     QVariant action_data = sAction->data();
@@ -811,11 +811,7 @@ void MainWindow::updateNewsLabel()
 
 QList<int> stringToIntList(const QString& string)
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
     QStringList split = string.split(',', Qt::SkipEmptyParts);
-#else
-    QStringList split = string.split(',', QString::SkipEmptyParts);
-#endif
     QList<int> out;
     for (int i = 0; i < split.size(); ++i) {
         out.append(split.at(i).toInt());
diff --git a/launcher/ui/dialogs/NewInstanceDialog.cpp b/launcher/ui/dialogs/NewInstanceDialog.cpp
index d9ea0aafb..6036663ba 100644
--- a/launcher/ui/dialogs/NewInstanceDialog.cpp
+++ b/launcher/ui/dialogs/NewInstanceDialog.cpp
@@ -136,11 +136,7 @@ NewInstanceDialog::NewInstanceDialog(const QString& initialGroup,
     if (APPLICATION->settings()->get("NewInstanceGeometry").isValid()) {
         restoreGeometry(QByteArray::fromBase64(APPLICATION->settings()->get("NewInstanceGeometry").toByteArray()));
     } else {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
         auto screen = parent->screen();
-#else
-        auto screen = QGuiApplication::primaryScreen();
-#endif
         auto geometry = screen->availableSize();
         resize(width(), qMin(geometry.height() - 50, 710));
     }
diff --git a/launcher/ui/dialogs/skins/draw/SkinOpenGLWindow.cpp b/launcher/ui/dialogs/skins/draw/SkinOpenGLWindow.cpp
index 97fe44175..e1e539050 100644
--- a/launcher/ui/dialogs/skins/draw/SkinOpenGLWindow.cpp
+++ b/launcher/ui/dialogs/skins/draw/SkinOpenGLWindow.cpp
@@ -76,8 +76,8 @@ void SkinOpenGLWindow::mousePressEvent(QMouseEvent* e)
 void SkinOpenGLWindow::mouseMoveEvent(QMouseEvent* event)
 {
     if (m_isMousePressed) {
-        int dx = event->x() - m_mousePosition.x();
-        int dy = event->y() - m_mousePosition.y();
+        int dx = event->position().x() - m_mousePosition.x();
+        int dy = event->position().y() - m_mousePosition.y();
 
         m_yaw += dx * 0.5f;
         m_pitch += dy * 0.5f;
diff --git a/launcher/ui/instanceview/InstanceView.cpp b/launcher/ui/instanceview/InstanceView.cpp
index c677f3951..f52c994d3 100644
--- a/launcher/ui/instanceview/InstanceView.cpp
+++ b/launcher/ui/instanceview/InstanceView.cpp
@@ -400,12 +400,8 @@ void InstanceView::mouseReleaseEvent(QMouseEvent* event)
         if (event->button() == Qt::LeftButton) {
             emit clicked(index);
         }
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
         QStyleOptionViewItem option;
         initViewItemOption(&option);
-#else
-        QStyleOptionViewItem option = viewOptions();
-#endif
         if (m_pressedAlreadySelected) {
             option.state |= QStyle::State_Selected;
         }
@@ -422,7 +418,7 @@ void InstanceView::mouseDoubleClickEvent(QMouseEvent* event)
 
     QModelIndex index = indexAt(event->pos());
     if (!index.isValid() || !(index.flags() & Qt::ItemIsEnabled) || (m_pressedIndex != index)) {
-        QMouseEvent me(QEvent::MouseButtonPress, event->localPos(), event->windowPos(), event->screenPos(), event->button(),
+        QMouseEvent me(QEvent::MouseButtonPress, event->position(), event->scenePosition(), event->globalPosition(), event->button(),
                        event->buttons(), event->modifiers());
         mousePressEvent(&me);
         return;
@@ -431,12 +427,8 @@ void InstanceView::mouseDoubleClickEvent(QMouseEvent* event)
     QPersistentModelIndex persistent = index;
     emit doubleClicked(persistent);
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     QStyleOptionViewItem option;
     initViewItemOption(&option);
-#else
-    QStyleOptionViewItem option = viewOptions();
-#endif
     if ((model()->flags(index) & Qt::ItemIsEnabled) && !style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick, &option, this)) {
         emit activated(index);
     }
@@ -472,12 +464,8 @@ void InstanceView::paintEvent([[maybe_unused]] QPaintEvent* event)
         painter.setOpacity(1.0);
     }
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     QStyleOptionViewItem option;
     initViewItemOption(&option);
-#else
-    QStyleOptionViewItem option = viewOptions();
-#endif
     option.widget = this;
 
     if (model()->rowCount() == 0) {
@@ -610,7 +598,7 @@ void InstanceView::dragEnterEvent(QDragEnterEvent* event)
     if (!isDragEventAccepted(event)) {
         return;
     }
-    m_lastDragPosition = event->pos() + offset();
+    m_lastDragPosition = event->position().toPoint() + offset();
     viewport()->update();
     event->accept();
 }
@@ -622,7 +610,7 @@ void InstanceView::dragMoveEvent(QDragMoveEvent* event)
     if (!isDragEventAccepted(event)) {
         return;
     }
-    m_lastDragPosition = event->pos() + offset();
+    m_lastDragPosition = event->position().toPoint() + offset();
     viewport()->update();
     event->accept();
 }
@@ -648,7 +636,7 @@ void InstanceView::dropEvent(QDropEvent* event)
 
     if (event->source() == this) {
         if (event->possibleActions() & Qt::MoveAction) {
-            std::pair<VisualGroup*, VisualGroup::HitResults> dropPos = rowDropPos(event->pos());
+            std::pair<VisualGroup*, VisualGroup::HitResults> dropPos = rowDropPos(event->position().toPoint());
             const VisualGroup* group = dropPos.first;
             auto hitResult = dropPos.second;
 
@@ -732,12 +720,8 @@ QRect InstanceView::geometryRect(const QModelIndex& index) const
     int x = pos.first;
     // int y = pos.second;
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     QStyleOptionViewItem option;
     initViewItemOption(&option);
-#else
-    QStyleOptionViewItem option = viewOptions();
-#endif
 
     QRect out;
     out.setTop(cat->verticalPosition() + cat->headerHeight() + 5 + cat->rowTopOf(index));
@@ -784,12 +768,8 @@ QPixmap InstanceView::renderToPixmap(const QModelIndexList& indices, QRect* r) c
     QPixmap pixmap(r->size());
     pixmap.fill(Qt::transparent);
     QPainter painter(&pixmap);
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     QStyleOptionViewItem option;
     initViewItemOption(&option);
-#else
-    QStyleOptionViewItem option = viewOptions();
-#endif
     option.state |= QStyle::State_Selected;
     for (int j = 0; j < paintPairs.count(); ++j) {
         option.rect = paintPairs.at(j).first.translated(-r->topLeft());
diff --git a/launcher/ui/instanceview/VisualGroup.cpp b/launcher/ui/instanceview/VisualGroup.cpp
index 83103c502..089db8ad7 100644
--- a/launcher/ui/instanceview/VisualGroup.cpp
+++ b/launcher/ui/instanceview/VisualGroup.cpp
@@ -73,12 +73,8 @@ void VisualGroup::update()
             positionInRow = 0;
             maxRowHeight = 0;
         }
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
         QStyleOptionViewItem viewItemOption;
         view->initViewItemOption(&viewItemOption);
-#else
-        QStyleOptionViewItem viewItemOption = view->viewOptions();
-#endif
 
         auto itemHeight = view->itemDelegate()->sizeHint(viewItemOption, item).height();
         if (itemHeight > maxRowHeight) {
diff --git a/launcher/ui/pages/instance/ServersPage.cpp b/launcher/ui/pages/instance/ServersPage.cpp
index f8cd8304f..245bbffe2 100644
--- a/launcher/ui/pages/instance/ServersPage.cpp
+++ b/launcher/ui/pages/instance/ServersPage.cpp
@@ -255,11 +255,7 @@ class ServersModel : public QAbstractListModel {
             return false;
         }
         beginMoveRows(QModelIndex(), row, row, QModelIndex(), row - 1);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 13, 0)
         m_servers.swapItemsAt(row - 1, row);
-#else
-        m_servers.swap(row - 1, row);
-#endif
         endMoveRows();
         scheduleSave();
         return true;
@@ -275,11 +271,7 @@ class ServersModel : public QAbstractListModel {
             return false;
         }
         beginMoveRows(QModelIndex(), row, row, QModelIndex(), row + 2);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 13, 0)
         m_servers.swapItemsAt(row + 1, row);
-#else
-        m_servers.swap(row + 1, row);
-#endif
         endMoveRows();
         scheduleSave();
         return true;
diff --git a/libraries/LocalPeer/CMakeLists.txt b/libraries/LocalPeer/CMakeLists.txt
index f6de6581c..dd78647c0 100644
--- a/libraries/LocalPeer/CMakeLists.txt
+++ b/libraries/LocalPeer/CMakeLists.txt
@@ -1,9 +1,7 @@
 cmake_minimum_required(VERSION 3.15)
 project(LocalPeer)
 
-if(QT_VERSION_MAJOR EQUAL 5)
-    find_package(Qt5 COMPONENTS Core Network REQUIRED)
-elseif(Launcher_QT_VERSION_MAJOR EQUAL 6)
+if(Launcher_QT_VERSION_MAJOR EQUAL 6)
     find_package(Qt6 COMPONENTS Core Network Core5Compat REQUIRED)
     list(APPEND LocalPeer_LIBS Qt${QT_VERSION_MAJOR}::Core5Compat)
 endif()
diff --git a/libraries/LocalPeer/src/LocalPeer.cpp b/libraries/LocalPeer/src/LocalPeer.cpp
index c1875bf98..3761c109e 100644
--- a/libraries/LocalPeer/src/LocalPeer.cpp
+++ b/libraries/LocalPeer/src/LocalPeer.cpp
@@ -75,7 +75,7 @@ ApplicationId ApplicationId::fromTraditionalApp()
     prefix.remove(QRegularExpression("[^a-zA-Z]"));
     prefix.truncate(6);
     QByteArray idc = protoId.toUtf8();
-    quint16 idNum = qChecksum(idc.constData(), idc.size());
+    quint16 idNum = qChecksum(idc);
     auto socketName = QLatin1String("pl") + prefix + QLatin1Char('-') + QString::number(idNum, 16).left(12);
 #if defined(Q_OS_WIN)
     if (!pProcessIdToSessionId) {
diff --git a/libraries/qdcss/CMakeLists.txt b/libraries/qdcss/CMakeLists.txt
index ab8aaef94..7e497feca 100644
--- a/libraries/qdcss/CMakeLists.txt
+++ b/libraries/qdcss/CMakeLists.txt
@@ -1,9 +1,7 @@
 cmake_minimum_required(VERSION 3.15)
 project(qdcss)
 
-if(QT_VERSION_MAJOR EQUAL 5)
-    find_package(Qt5 COMPONENTS Core REQUIRED)
-elseif(Launcher_QT_VERSION_MAJOR EQUAL 6)
+if(Launcher_QT_VERSION_MAJOR EQUAL 6)
     find_package(Qt6 COMPONENTS Core Core5Compat REQUIRED)
     list(APPEND qdcss_LIBS Qt${QT_VERSION_MAJOR}::Core5Compat)
 endif()
diff --git a/libraries/rainbow/CMakeLists.txt b/libraries/rainbow/CMakeLists.txt
index 0867b2d27..c971889d8 100644
--- a/libraries/rainbow/CMakeLists.txt
+++ b/libraries/rainbow/CMakeLists.txt
@@ -1,9 +1,7 @@
 cmake_minimum_required(VERSION 3.15)
 project(rainbow)
 
-if(QT_VERSION_MAJOR EQUAL 5)
-    find_package(Qt5 COMPONENTS Core Gui REQUIRED)
-elseif(Launcher_QT_VERSION_MAJOR EQUAL 6)
+if(Launcher_QT_VERSION_MAJOR EQUAL 6)
     find_package(Qt6 COMPONENTS Core Gui REQUIRED)
 endif()
 
diff --git a/libraries/systeminfo/CMakeLists.txt b/libraries/systeminfo/CMakeLists.txt
index 33d246050..80b6b8094 100644
--- a/libraries/systeminfo/CMakeLists.txt
+++ b/libraries/systeminfo/CMakeLists.txt
@@ -1,8 +1,6 @@
 project(systeminfo)
 
-if(QT_VERSION_MAJOR EQUAL 5)
-    find_package(Qt5 COMPONENTS Core REQUIRED)
-elseif(Launcher_QT_VERSION_MAJOR EQUAL 6)
+if(Launcher_QT_VERSION_MAJOR EQUAL 6)
     find_package(Qt6 COMPONENTS Core Core5Compat REQUIRED)
     list(APPEND systeminfo_LIBS Qt${QT_VERSION_MAJOR}::Core5Compat)
 endif()
diff --git a/libraries/systeminfo/src/distroutils.cpp b/libraries/systeminfo/src/distroutils.cpp
index 57e6c8320..5891282fe 100644
--- a/libraries/systeminfo/src/distroutils.cpp
+++ b/libraries/systeminfo/src/distroutils.cpp
@@ -145,11 +145,7 @@ void Sys::lsb_postprocess(Sys::LsbInfo& lsb, Sys::DistributionInfo& out)
         vers = lsb.codename;
     } else {
         // ubuntu, debian, gentoo, scientific, slackware, ... ?
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
         auto parts = dist.split(QRegularExpression("\\s+"), Qt::SkipEmptyParts);
-#else
-        auto parts = dist.split(QRegularExpression("\\s+"), QString::SkipEmptyParts);
-#endif
         if (parts.size()) {
             dist = parts[0];
         }
@@ -182,11 +178,7 @@ QString Sys::_extract_distribution(const QString& x)
     if (release.startsWith("suse linux enterprise")) {
         return "sles";
     }
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
     QStringList list = release.split(QRegularExpression("\\s+"), Qt::SkipEmptyParts);
-#else
-    QStringList list = release.split(QRegularExpression("\\s+"), QString::SkipEmptyParts);
-#endif
     if (list.size()) {
         return list[0];
     }
@@ -196,11 +188,7 @@ QString Sys::_extract_distribution(const QString& x)
 QString Sys::_extract_version(const QString& x)
 {
     QRegularExpression versionish_string(QRegularExpression::anchoredPattern("\\d+(?:\\.\\d+)*$"));
-#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
     QStringList list = x.split(QRegularExpression("\\s+"), Qt::SkipEmptyParts);
-#else
-    QStringList list = x.split(QRegularExpression("\\s+"), QString::SkipEmptyParts);
-#endif
     for (int i = list.size() - 1; i >= 0; --i) {
         QString chunk = list[i];
         if (versionish_string.match(chunk).hasMatch()) {
diff --git a/nix/unwrapped.nix b/nix/unwrapped.nix
index 060518242..b5b02b101 100644
--- a/nix/unwrapped.nix
+++ b/nix/unwrapped.nix
@@ -98,9 +98,6 @@ stdenv.mkDerivation {
     ++ lib.optionals (msaClientID != null) [
       (lib.cmakeFeature "Launcher_MSA_CLIENT_ID" (toString msaClientID))
     ]
-    ++ lib.optionals (lib.versionOlder kdePackages.qtbase.version "6") [
-      (lib.cmakeFeature "Launcher_QT_VERSION_MAJOR" "5")
-    ]
     ++ lib.optionals stdenv.hostPlatform.isDarwin [
       # we wrap our binary manually
       (lib.cmakeFeature "INSTALL_BUNDLE" "nodeps")