diff --git a/.github/workflows/linux-kotato.yml b/.github/workflows/linux-kotato.yml
index 386b4c791..ee7779d5b 100644
--- a/.github/workflows/linux-kotato.yml
+++ b/.github/workflows/linux-kotato.yml
@@ -68,7 +68,7 @@ jobs:
 
     env:
       GIT: "https://github.com"
-      QT: "5_15_2"
+      QT: "6_2_3"
       CMAKE_VER: "3.21.3"
       UPLOAD_ARTIFACT: "true"
       ONLY_CACHE: "false"
@@ -124,7 +124,7 @@ jobs:
 
       - name: First set up.
         run: |
-          wget -c -nv "https://github.com/probonopd/linuxdeployqt/releases/download/continuous/linuxdeployqt-continuous-x86_64.AppImage"
+          wget -c -nv "$GIT/probonopd/linuxdeployqt/releases/download/continuous/linuxdeployqt-continuous-x86_64.AppImage"
           chmod a+x linuxdeployqt-continuous-x86_64.AppImage
 
           ./linuxdeployqt-continuous-x86_64.AppImage -version
@@ -178,7 +178,7 @@ jobs:
         run: |
           cd $LibrariesPath
 
-          git clone -b v5.88.0 --depth=1 $GIT/KDE/extra-cmake-modules.git
+          git clone -b v5.90.0 --depth=1 $GIT/KDE/extra-cmake-modules.git
           cd extra-cmake-modules
           cmake -B build -GNinja . -DCMAKE_BUILD_TYPE=Release
           cmake --build build --parallel
@@ -195,7 +195,7 @@ jobs:
         run: |
           cd $LibrariesPath
 
-          wget https://github.com/ninja-build/ninja/releases/download/v1.10.0/ninja-linux.zip
+          wget $GIT/ninja-build/ninja/releases/download/v1.10.0/ninja-linux.zip
           unzip ninja-linux.zip
           chmod +x ninja
           mv ninja /usr/local/bin
@@ -229,7 +229,7 @@ jobs:
         run: |
           cd $LibrariesPath
 
-          git clone -b v1.3 --depth=1 $GIT/xiph/opus
+          git clone -b v1.3.1 --depth=1 $GIT/xiph/opus
           cd opus
           ./autogen.sh
           ./configure
@@ -310,11 +310,11 @@ jobs:
         run: |
           cd $LibrariesPath
 
-          git clone -b 1.23 --depth=1 https://gitlab.freedesktop.org/wayland/wayland-protocols.git
+          git clone -b 1.24 --depth=1 https://gitlab.freedesktop.org/wayland/wayland-protocols.git
           cd wayland-protocols
-          ./autogen.sh
-          make -j$(nproc)
-          make install
+          meson build --buildtype=release -Dtests=false
+          meson compile -C build
+          meson install -C build
           cd ..
           rm -rf wayland-protocols
 
@@ -322,7 +322,7 @@ jobs:
         run: |
           cd $LibrariesPath
 
-          git clone -b v1.4.0 --depth=1 $GIT/KDE/plasma-wayland-protocols.git
+          git clone -b v1.5.0 --depth=1 $GIT/KDE/plasma-wayland-protocols.git
           cd plasma-wayland-protocols
           cmake -B build -GNinja . -DCMAKE_BUILD_TYPE=Release
           cmake --build build --parallel
@@ -330,116 +330,103 @@ jobs:
           cd ..
           rm -rf plasma-wayland-protocols
 
-      - name: Qt 5.15.2 cache.
+      - name: Libepoxy.
+        run: |
+          cd $LibrariesPath
+
+          git clone -b 1.5.9 --depth=1 $GIT/anholt/libepoxy.git
+
+          cd libepoxy
+          git apply ../patches/libepoxy.patch
+
+          meson build \
+          --buildtype=release \
+          --default-library=static \
+          -Dtests=false
+
+          meson compile -C build
+          meson install -C build
+          cd ..
+          rm -rf libepoxy
+
+      - name: Qt 6.2.3 cache.
         id: cache-qt
         uses: actions/cache@v2
         with:
           path: ${{ env.LibrariesPath }}/qt-cache
-          key: ${{ runner.OS }}-qt-${{ env.CACHE_KEY }}-${{ hashFiles('**/qtbase_5_15_2/*') }}-${{ hashFiles('**/qtwayland_5_15_2/*') }}
-      - name: Qt 5.15.2 build.
+          key: ${{ runner.OS }}-qt-${{ env.CACHE_KEY }}-${{ hashFiles('**/qtbase_6_2_3/*') }}-${{ hashFiles('**/qtwayland_6_2_3/*') }}-${{ hashFiles('**/qt5compat_6_2_3/*') }}
+      - name: Qt 6.2.3 build.
         if: steps.cache-qt.outputs.cache-hit != 'true'
         run: |
           cd $LibrariesPath
 
-          git clone -b v5.15.2 --depth=1 git://code.qt.io/qt/qt5.git qt_${QT}
+          git clone -b v6.2.3 --depth=1 git://code.qt.io/qt/qt5.git qt_${QT}
           cd qt_${QT}
-          perl init-repository --module-subset=qtbase,qtwayland,qtimageformats,qtsvg,qttools,qtx11extras
+          perl init-repository --module-subset=qtbase,qtwayland,qtimageformats,qtsvg,qt5compat,qttools
           cd qtbase
           find ../../patches/qtbase_${QT} -type f -print0 | sort -z | xargs -r0 git apply
           cd ../qtwayland
           find ../../patches/qtwayland_${QT} -type f -print0 | sort -z | xargs -r0 git apply
+          cd ../qt5compat
+          find ../../patches/qt5compat_${QT} -type f -print0 | sort -z | xargs -r0 git apply
           cd ..
 
           ./configure -prefix /usr/local \
           -release \
           -opensource \
           -confirm-license \
-          -xcb \
           -qt-libpng \
           -qt-harfbuzz \
           -qt-pcre \
           -no-feature-xcb-sm \
-          -no-feature-wayland-server \
+          -no-feature-highdpiscaling \
           -openssl-linked \
-          QMAKE_CXX="$CXX" \
-          QMAKE_LINK="$CXX" \
           -nomake examples \
           -nomake tests
 
-          make -j$(nproc)
-          make INSTALL_ROOT="$LibrariesPath/qt-cache" install
+          cmake --build . --parallel
+          DESTDIR="$LibrariesPath/qt-cache" cmake --install .
           cd ..
           rm -rf qt_${QT}
-      - name: Qt 5.15.2 install.
+      - name: Qt 6.2.3 install.
         run: |
           cd $LibrariesPath
           cp -R qt-cache/. /
           ldconfig
 
-      - name: Qt Style Plugins.
+      - name: Qt6Gtk2.
         run: |
           cd $LibrariesPath
 
-          git clone --depth=1 git://code.qt.io/qt/qtstyleplugins.git
-          cd qtstyleplugins
-          find ../patches/qtstyleplugins -type f -print0 | sort -z | xargs -r0 git apply
+          git clone -b 0.1 --depth=1 $GIT/trialuser02/qt6gtk2.git
+          cd qt6gtk2
+          wget https://github.com/trialuser02/qt6gtk2/commit/3d2cf8cbade92a175b2c878090f5f44a1b8a395c.patch
+          git apply 3d2cf8cbade92a175b2c878090f5f44a1b8a395c.patch
           qmake
           make -j$(nproc)
           make install
           cd ..
-          rm -rf qtstyleplugins
+          rm -rf qt6gtk2
 
-      - name: KWayland.
+      - name: Qt6Ct.
         run: |
           cd $LibrariesPath
 
-          git clone -b v5.88.0 --depth=1 $GIT/KDE/kwayland.git
-          cd kwayland
-          cmake -B build -GNinja \
-          -DCMAKE_BUILD_TYPE=Release \
-          -DBUILD_TESTING=OFF \
-          -DKDE_INSTALL_LIBDIR=lib
-          cmake --build build --parallel
-          cmake --install build
-          ldconfig
-          cd ..
-          rm -rf kwayland
-
-      - name: KWindowSystem.
-        run: |
-          cd $LibrariesPath
-
-          git clone -b v5.88.0 --depth=1 $GIT/KDE/kwindowsystem.git
-          cd kwindowsystem
-          cmake -B build -GNinja \
-          -DCMAKE_BUILD_TYPE=Release \
-          -DBUILD_TESTING=OFF \
-          -DKDE_INSTALL_LIBDIR=lib
-          cmake --build build --parallel
-          cmake --install build
-          ldconfig
-          cd ..
-          rm -rf kwindowsystem
-
-      - name: Qt5Ct.
-        run: |
-          cd $LibrariesPath
-
-          svn checkout https://svn.code.sf.net/p/qt5ct/code/tags/qt5ct-1.5 qt5ct
-          cd qt5ct
+          git clone -b 0.5 --depth=1 $GIT/trialuser02/qt6ct.git
+          cd qt6ct
           cmake -B build -GNinja -DCMAKE_BUILD_TYPE=Release
           cmake --build build --parallel
           cmake --install build
           cd ..
-          rm -rf qt5ct
+          rm -rf qt6ct
 
       - name: Kvantum.
         run: |
           cd $LibrariesPath
 
-          git clone -b V0.20.2 --depth=1 $GIT/tsujan/Kvantum.git
+          git clone -b V1.0.0 --depth=1 $GIT/tsujan/Kvantum.git
           cd Kvantum/Kvantum
-          cmake -B build -GNinja -DCMAKE_BUILD_TYPE=Release
+          cmake -B build -GNinja -DCMAKE_BUILD_TYPE=Release -DENABLE_QT5=OFF
           cmake --build build --parallel
           cmake --install build
           cd ../..
@@ -496,9 +483,9 @@ jobs:
           -DCMAKE_INSTALL_PREFIX=/usr \
           -DCMAKE_C_FLAGS="-Werror" \
           -DCMAKE_CXX_FLAGS="-Werror" \
+          -DCMAKE_EXE_LINKER_FLAGS="-s" \
           -DTDESKTOP_API_TEST=ON \
           -DDESKTOP_APP_USE_PACKAGED_LAZY=ON \
-          -DDESKTOP_APP_QT6=OFF \
           $DEFINE
 
           cmake --build ../out --config Debug --parallel
@@ -514,7 +501,7 @@ jobs:
           AppDir/usr/share/applications/*.desktop \
           -appimage \
           -exclude-libs=libatk-1.0.so.0,libatk-bridge-2.0.so.0,libatspi.so.0,libcairo-gobject.so.2,libcairo.so.2,libgdk-3.so.0,libgdk_pixbuf-2.0.so.0,libgdk-x11-2.0.so.0,libgmodule-2.0.so.0,libgtk-3.so.0,libgtk-x11-2.0.so.0,libpixman-1.so.0,libpng12.so.0 \
-          -extra-plugins=bearer,iconengines,imageformats,platforminputcontexts,platforms/libqwayland-egl.so,platforms/libqwayland-generic.so,platformthemes/libqgtk3.so,platformthemes/libqxdgdesktopportal.so,platformthemes/libqt5ct.so,styles/libqt5ct-style.so,styles/libkvantum.so,wayland-decoration-client,wayland-graphics-integration-client,wayland-shell-integration
+          -extra-plugins=iconengines,imageformats,platforminputcontexts,platforms/libqwayland-egl.so,platforms/libqwayland-generic.so,platformthemes/libqgtk3.so,platformthemes/libqxdgdesktopportal.so,platformthemes/libqt6ct.so,platformthemes/libqt6gtk2.so,styles/libqt6ct-style.so,styles/libqt6gtk2-style.so,styles/libkvantum.so,wayland-decoration-client,wayland-graphics-integration-client,wayland-shell-integration
 
           appimage_name=$(echo Kotatogram_Desktop*.AppImage)
           echo "APPIMAGE_NAME=$appimage_name" >> $GITHUB_ENV
diff --git a/Telegram/SourceFiles/kotato/json_settings.cpp b/Telegram/SourceFiles/kotato/json_settings.cpp
index 155fdad56..f635501e1 100644
--- a/Telegram/SourceFiles/kotato/json_settings.cpp
+++ b/Telegram/SourceFiles/kotato/json_settings.cpp
@@ -649,9 +649,11 @@ bool Manager::readCustomFile() {
 		cSetShowTopBarUserpic(v);
 	});
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 	ReadBoolOption(settings, "qt_scale", [&](auto v) {
 		cSetQtScale(v);
 	});
+#endif // Qt < 6.0.0
 
 	ReadIntOption(settings, "file_dialog_type", [&](auto v) {
 		using Platform::FileDialog::ImplementationType;
diff --git a/Telegram/SourceFiles/kotato/settings_menu.cpp b/Telegram/SourceFiles/kotato/settings_menu.cpp
index f396503e5..621b5abda 100644
--- a/Telegram/SourceFiles/kotato/settings_menu.cpp
+++ b/Telegram/SourceFiles/kotato/settings_menu.cpp
@@ -572,6 +572,7 @@ void SetupKotatoSystem(
 	AddSkip(container);
 	AddSubsectionTitle(container, rktr("ktg_settings_system"));
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 	const auto qtScaleToggled = Ui::CreateChild<rpl::event_stream<bool>>(
 		container.get());
 	AddButton(
@@ -598,6 +599,7 @@ void SetupKotatoSystem(
 			confirmed,
 			cancelled));
 	}, container->lifetime());
+#endif // Qt < 6.0.0
 
 	if (Platform::IsLinux()) {
 		auto fileDialogTypeText = rpl::single(