diff --git a/.github/workflows/mac.yml b/.github/workflows/mac.yml
index 66290be8e9..36b4867ab6 100644
--- a/.github/workflows/mac.yml
+++ b/.github/workflows/mac.yml
@@ -13,7 +13,6 @@ on:
       - '!.github/workflows/mac.yml'
       - 'lib/xdg/**'
       - 'snap/**'
-      - 'Telegram/build/**'
       - 'Telegram/Resources/uwp/**'
       - 'Telegram/Resources/winrc/**'
       - 'Telegram/SourceFiles/platform/win/**'
@@ -31,7 +30,6 @@ on:
       - '!.github/workflows/mac.yml'
       - 'lib/xdg/**'
       - 'snap/**'
-      - 'Telegram/build/**'
       - 'Telegram/Resources/uwp/**'
       - 'Telegram/Resources/winrc/**'
       - 'Telegram/SourceFiles/platform/win/**'
@@ -49,19 +47,8 @@ jobs:
         defines:
           - ""
     env:
-      MIN_MAC: "-mmacosx-version-min=10.12"
-      UNGUARDED: "-Werror=unguarded-availability-new"
-      GIT: "https://github.com"
-      MACOSX_DEPLOYMENT_TARGET: "10.12"
-      XZ: "xz-5.2.5"
-      QT: "5_15_2"
-      OPENSSL_VER: "1_1_1"
-      LIBICONV_VER: "libiconv-1.16"
       UPLOAD_ARTIFACT: "false"
       ONLY_CACHE: "false"
-      MANUAL_CACHING: "2"
-      DOC_PATH: "docs/building-mac.md"
-      AUTO_CACHING: "1"
 
     steps:
       - name: Get repository name.
@@ -84,432 +71,23 @@ jobs:
 
           sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
 
-          xcodebuild -version > CACHE_KEY.txt
-          echo $MIN_MAC >> CACHE_KEY.txt
-          echo $MANUAL_CACHING >> CACHE_KEY.txt
-          echo "$GITHUB_WORKSPACE" >> CACHE_KEY.txt
-          if [ "$AUTO_CACHING" == "1" ]; then
-            thisFile=$REPO_NAME/.github/workflows/mac.yml
-            echo `md5 -q $thisFile` >> CACHE_KEY.txt
-          fi
-          echo "CACHE_KEY=`md5 -q CACHE_KEY.txt`" >> $GITHUB_ENV
-
-          echo "$PWD/Libraries/depot_tools" >> $GITHUB_PATH
-
-          mkdir -p Libraries/local
-          cd Libraries
-          echo "LibrariesPath=`pwd`" >> $GITHUB_ENV
-          echo "PREFIX=`pwd`/local" >> $GITHUB_ENV
-          echo "QT_PREFIX=`pwd`/local/Qt-5.15.2" >> $GITHUB_ENV
-
-          curl -o tg_owt-version.json https://api.github.com/repos/desktop-app/tg_owt/git/refs/heads/master
-
-      - name: Patches.
-        run: |
-          echo "Find necessary commit from doc."
-          checkoutCommit=$(grep -A 1 "cd patches" $REPO_NAME/$DOC_PATH | sed -n 2p)
-          cd $LibrariesPath
-          git clone $GIT/desktop-app/patches.git
-          cd Patches
-          eval $checkoutCommit
-
-      - name: XZ.
-        run: |
-          cd $LibrariesPath
-
-          wget https://tukaani.org/xz/$XZ.tar.gz
-          tar -xvzf $XZ.tar.gz
-          cd $XZ
-          CFLAGS="$MIN_MAC" LDFLAGS="$MIN_MAC" ./configure --prefix=$PREFIX
-          make -j$(nproc)
-          make install
-
-      - name: Zlib.
-        run: |
-          cd $LibrariesPath
-
-          git clone $GIT/desktop-app/zlib.git
-          cd zlib
-          CFLAGS="$MIN_MAC $UNGUARDED" LDFLAGS="$MIN_MAC" ./configure --prefix=$PREFIX
-          make -j$(nproc)
-          make install
-
-      - name: MozJPEG.
-        run: |
-          cd $LibrariesPath
-
-          git clone -b v4.0.1-rc2 $GIT/mozilla/mozjpeg.git
-          cd mozjpeg
-          cmake -B build . \
-          -DCMAKE_BUILD_TYPE=Release \
-          -DCMAKE_INSTALL_PREFIX=$PREFIX \
-          -DWITH_JPEG8=ON \
-          -DPNG_SUPPORTED=OFF
-          cmake --build build -j$(nproc)
-          cmake --install build
-
-      - name: OpenSSL cache.
-        id: cache-openssl
+      - name: ThirdParty cache.
+        id: cache-third-party
         uses: actions/cache@v2
         with:
-          path: ${{ env.LibrariesPath }}/openssl_${{ env.OPENSSL_VER }}
-          key: ${{ runner.OS }}-${{ env.OPENSSL_VER }}-${{ env.CACHE_KEY }}
-      - name: OpenSSL.
-        if: steps.cache-openssl.outputs.cache-hit != 'true'
-        run: |
-          cd $LibrariesPath
+          path: ThirdParty
+          key: ${{ runner.OS }}-third-party
 
-          git clone $GIT/openssl/openssl openssl
-          cd openssl
-          git checkout OpenSSL_"$OPENSSL_VER"-stable
-          ./Configure \
-          --prefix=$PREFIX \
-          no-tests \
-          darwin64-x86_64-cc \
-          -static \
-          $MIN_MAC
-          make build_libs -j$(nproc)
-
-          SSL_DIR=$LibrariesPath/openssl_$OPENSSL_VER
-          mkdir -p $SSL_DIR/include
-          copyLib() {
-            cp $1.a $SSL_DIR/$1.a
-          }
-          copyLib libssl
-          copyLib libcrypto
-          cp -R include/. $SSL_DIR/include/
-
-      - name: Opus cache.
-        id: cache-opus
+      - name: Libraries cache.
+        id: cache-libs
         uses: actions/cache@v2
         with:
-          path: ${{ env.LibrariesPath }}/opus-cache
-          key: ${{ runner.OS }}-opus-${{ env.CACHE_KEY }}
-      - name: Opus.
-        if: steps.cache-opus.outputs.cache-hit != 'true'
+          path: Libraries
+          key: ${{ runner.OS }}-libs
+
+      - name: Libraries.
         run: |
-          cd $LibrariesPath
-
-          git clone $GIT/xiph/opus
-          cd opus
-          git checkout v1.3
-          ./autogen.sh
-          CFLAGS="$MIN_MAC $UNGUARDED" CPPFLAGS="$MIN_MAC $UNGUARDED" LDFLAGS="$MIN_MAC" ./configure --prefix=$LibrariesPath/opus-cache
-          make -j$(nproc)
-          make install
-      - name: Opus install.
-        run: |
-          cd $LibrariesPath
-          cp -R opus-cache/. local/
-
-      - name: Rnnoise.
-        run: |
-          cd $LibrariesPath
-
-          git clone $GIT/desktop-app/rnnoise.git
-          mkdir -p rnnoise/out/Debug
-          cd rnnoise/out/Debug
-          cmake -G Ninja -DCMAKE_BUILD_TYPE=Debug ../..
-          ninja
-
-      - name: Libiconv cache.
-        id: cache-libiconv
-        uses: actions/cache@v2
-        with:
-          path: ${{ env.LibrariesPath }}/libiconv-cache
-          key: ${{ runner.OS }}-${{ env.LIBICONV_VER }}-${{ env.CACHE_KEY }}
-      - name: Libiconv.
-        if: steps.cache-libiconv.outputs.cache-hit != 'true'
-        run: |
-          cd $LibrariesPath
-
-          wget https://ftp.gnu.org/pub/gnu/libiconv/"$LIBICONV_VER".tar.gz
-          tar -xvzf "$LIBICONV_VER".tar.gz
-          cd $LIBICONV_VER
-          CFLAGS="$MIN_MAC $UNGUARDED" CPPFLAGS="$MIN_MAC $UNGUARDED" LDFLAGS="$MIN_MAC" ./configure --enable-static --prefix=$LibrariesPath/libiconv-cache
-          make -j$(nproc)
-          make install
-      - name: Libiconv install.
-        run: |
-          cd $LibrariesPath
-          cp -R libiconv-cache/. local/
-
-      - name: FFmpeg cache.
-        id: cache-ffmpeg
-        uses: actions/cache@v2
-        with:
-          path: ${{ env.LibrariesPath }}/ffmpeg-cache
-          key: ${{ runner.OS }}-ffmpeg-${{ env.CACHE_KEY }}
-      - name: FFmpeg.
-        if: steps.cache-ffmpeg.outputs.cache-hit != 'true'
-        run: |
-          cd $LibrariesPath
-
-          git clone $GIT/FFmpeg/FFmpeg.git ffmpeg
-          cd ffmpeg
-          git checkout release/4.4
-          CFLAGS=`freetype-config --cflags`
-          LDFLAGS=`freetype-config --libs`
-          PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig:/usr/X11/lib/pkgconfig
-
-          ./configure --prefix=$LibrariesPath/ffmpeg-cache \
-          --extra-cflags="$MIN_MAC $UNGUARDED" \
-          --extra-cxxflags="$MIN_MAC $UNGUARDED" \
-          --extra-ldflags="$MIN_MAC" \
-          --enable-protocol=file \
-          --enable-libopus \
-          --disable-programs \
-          --disable-doc \
-          --disable-network \
-          --disable-everything \
-          --enable-hwaccel=h264_videotoolbox \
-          --enable-hwaccel=hevc_videotoolbox \
-          --enable-hwaccel=mpeg1_videotoolbox \
-          --enable-hwaccel=mpeg2_videotoolbox \
-          --enable-hwaccel=mpeg4_videotoolbox \
-          --enable-decoder=aac \
-          --enable-decoder=aac_at \
-          --enable-decoder=aac_fixed \
-          --enable-decoder=aac_latm \
-          --enable-decoder=aasc \
-          --enable-decoder=alac \
-          --enable-decoder=alac_at \
-          --enable-decoder=flac \
-          --enable-decoder=gif \
-          --enable-decoder=h264 \
-          --enable-decoder=hevc \
-          --enable-decoder=mp1 \
-          --enable-decoder=mp1float \
-          --enable-decoder=mp2 \
-          --enable-decoder=mp2float \
-          --enable-decoder=mp3 \
-          --enable-decoder=mp3adu \
-          --enable-decoder=mp3adufloat \
-          --enable-decoder=mp3float \
-          --enable-decoder=mp3on4 \
-          --enable-decoder=mp3on4float \
-          --enable-decoder=mpeg4 \
-          --enable-decoder=msmpeg4v2 \
-          --enable-decoder=msmpeg4v3 \
-          --enable-decoder=opus \
-          --enable-decoder=pcm_alaw \
-          --enable-decoder=pcm_alaw_at \
-          --enable-decoder=pcm_f32be \
-          --enable-decoder=pcm_f32le \
-          --enable-decoder=pcm_f64be \
-          --enable-decoder=pcm_f64le \
-          --enable-decoder=pcm_lxf \
-          --enable-decoder=pcm_mulaw \
-          --enable-decoder=pcm_mulaw_at \
-          --enable-decoder=pcm_s16be \
-          --enable-decoder=pcm_s16be_planar \
-          --enable-decoder=pcm_s16le \
-          --enable-decoder=pcm_s16le_planar \
-          --enable-decoder=pcm_s24be \
-          --enable-decoder=pcm_s24daud \
-          --enable-decoder=pcm_s24le \
-          --enable-decoder=pcm_s24le_planar \
-          --enable-decoder=pcm_s32be \
-          --enable-decoder=pcm_s32le \
-          --enable-decoder=pcm_s32le_planar \
-          --enable-decoder=pcm_s64be \
-          --enable-decoder=pcm_s64le \
-          --enable-decoder=pcm_s8 \
-          --enable-decoder=pcm_s8_planar \
-          --enable-decoder=pcm_u16be \
-          --enable-decoder=pcm_u16le \
-          --enable-decoder=pcm_u24be \
-          --enable-decoder=pcm_u24le \
-          --enable-decoder=pcm_u32be \
-          --enable-decoder=pcm_u32le \
-          --enable-decoder=pcm_u8 \
-          --enable-decoder=vorbis \
-          --enable-decoder=wavpack \
-          --enable-decoder=wmalossless \
-          --enable-decoder=wmapro \
-          --enable-decoder=wmav1 \
-          --enable-decoder=wmav2 \
-          --enable-decoder=wmavoice \
-          --enable-encoder=libopus \
-          --enable-parser=aac \
-          --enable-parser=aac_latm \
-          --enable-parser=flac \
-          --enable-parser=h264 \
-          --enable-parser=hevc \
-          --enable-parser=mpeg4video \
-          --enable-parser=mpegaudio \
-          --enable-parser=opus \
-          --enable-parser=vorbis \
-          --enable-demuxer=aac \
-          --enable-demuxer=flac \
-          --enable-demuxer=gif \
-          --enable-demuxer=h264 \
-          --enable-demuxer=hevc \
-          --enable-demuxer=m4v \
-          --enable-demuxer=mov \
-          --enable-demuxer=mp3 \
-          --enable-demuxer=ogg \
-          --enable-demuxer=wav \
-          --enable-muxer=ogg \
-          --enable-muxer=opus
-
-          make -j$(nproc)
-          make install
-      - name: FFmpeg install.
-        run: |
-          cd $LibrariesPath
-          # List of files from cmake/external/ffmpeg/CMakeLists.txt.
-          copyLib() {
-            mkdir -p ffmpeg/$1
-            \cp -fR ffmpeg-cache/lib/$1.a ffmpeg/$1/$1.a
-          }
-          copyLib libavformat
-          copyLib libavcodec
-          copyLib libswresample
-          copyLib libswscale
-          copyLib libavutil
-
-          cp -R ffmpeg-cache/. $PREFIX
-          cp -R ffmpeg-cache/include/. ffmpeg/
-
-      - name: OpenAL Soft.
-        run: |
-          cd $LibrariesPath
-
-          git clone --branch capture_with_webrtc $GIT/telegramdesktop/openal-soft.git
-          cd openal-soft/build
-
-          CFLAGS="$UNGUARDED" CPPFLAGS="$UNGUARDED" cmake \
-          -D CMAKE_INSTALL_PREFIX:PATH=$PREFIX \
-          -D ALSOFT_EXAMPLES=OFF \
-          -D LIBTYPE:STRING=STATIC \
-          -D CMAKE_OSX_DEPLOYMENT_TARGET:STRING=$MACOSX_DEPLOYMENT_TARGET ..
-
-          make -j$(nproc)
-          make install
-
-      - name: Crashpad cache.
-        id: cache-crashpad
-        uses: actions/cache@v2
-        with:
-          path: ${{ env.LibrariesPath }}/crashpad
-          key: ${{ runner.OS }}-crashpad-${{ env.CACHE_KEY }}-${{ hashFiles('**/crashpad.diff') }}-${{ hashFiles('**/mini_chromium.diff') }}
-      - name: Crashpad.
-        if: steps.cache-crashpad.outputs.cache-hit != 'true'
-        run: |
-          cd Libraries
-          echo Install GYP for Crashpad.
-          git clone https://chromium.googlesource.com/external/gyp
-          git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
-          cd gyp
-          git checkout 9f2a7bb1
-          git apply $LibrariesPath/patches/gyp.diff
-          ./setup.py build
-          sudo ./setup.py install
-
-          cd $LibrariesPath
-
-          git clone https://chromium.googlesource.com/crashpad/crashpad.git
-          cd crashpad
-          git checkout feb3aa3923
-          git apply ../patches/crashpad.diff
-          cd third_party/mini_chromium
-          git clone https://chromium.googlesource.com/chromium/mini_chromium
-          cd mini_chromium
-          git checkout 7c5b0c1ab4
-          git apply ../../../../patches/mini_chromium.diff
-          cd ../../gtest
-          git clone https://chromium.googlesource.com/external/github.com/google/googletest gtest
-          cd gtest
-          git checkout d62d6c6556
-          cd ../../..
-
-          build/gyp_crashpad.py -Dmac_deployment_target=10.10
-          ninja -C out/Debug
-
-      - name: Qt 5.15.2 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/*') }}
-      - name: Use cached Qt 5.15.2.
-        if: steps.cache-qt.outputs.cache-hit == 'true'
-        run: |
-          cd $LibrariesPath
-          mv qt-cache Qt-5.15.2
-          mkdir -p $QT_PREFIX
-          mv -f Qt-5.15.2 "$(dirname "$QT_PREFIX")"/
-      - name: Qt 5.15.2 build.
-        if: steps.cache-qt.outputs.cache-hit != 'true'
-        run: |
-          cd $LibrariesPath
-
-          git clone git://code.qt.io/qt/qt5.git qt_$QT
-          cd qt_$QT
-          perl init-repository --module-subset=qtbase,qtimageformats,qtsvg
-          git checkout v5.15.2
-          git submodule update qtbase
-          git submodule update qtimageformats
-          git submodule update qtsvg
-          cd qtbase
-          find ../../patches/qtbase_$QT -type f -print0 | sort -z | xargs -0 git apply
-          cd ..
-
-          ./configure \
-          -prefix "$QT_PREFIX" \
-          -debug \
-          -force-debug-info \
-          -opensource \
-          -confirm-license \
-          -static \
-          -opengl desktop \
-          -no-openssl \
-          -securetransport \
-          -nomake examples \
-          -nomake tests \
-          -platform macx-clang \
-          -I "$PREFIX/include" \
-          LIBJPEG_LIBS="$PREFIX/lib/libjpeg.a" \
-          ZLIB_LIBS="$PREFIX/lib/libz.a"
-
-          make -j$(nproc)
-          make install
-
-          make clean
-          cp -r $QT_PREFIX $LibrariesPath/qt-cache
-
-      - name: WebRTC cache.
-        id: cache-webrtc
-        uses: actions/cache@v2
-        with:
-          path: ${{ env.LibrariesPath }}/tg_owt
-          key: ${{ runner.OS }}-webrtc-${{ env.CACHE_KEY }}-${{ hashFiles('**/tg_owt-version.json') }}
-      - name: WebRTC.
-        if: steps.cache-webrtc.outputs.cache-hit != 'true'
-        run: |
-          cd $LibrariesPath
-
-          git clone --recursive $GIT/desktop-app/tg_owt.git
-          mkdir -p tg_owt/out/Debug
-          cd tg_owt/out/Debug
-          cmake -G Ninja \
-          -DCMAKE_BUILD_TYPE=Debug \
-          -DTG_OWT_SPECIAL_TARGET=mac \
-          -DTG_OWT_BUILD_AUDIO_BACKENDS=OFF \
-          -DTG_OWT_LIBJPEG_INCLUDE_PATH=$PREFIX/include \
-          -DTG_OWT_OPENSSL_INCLUDE_PATH=`pwd`/../../../openssl_$OPENSSL_VER/include \
-          -DTG_OWT_OPUS_INCLUDE_PATH=$PREFIX/include/opus \
-          -DTG_OWT_FFMPEG_INCLUDE_PATH=$PREFIX/include \
-          ../..
-          ninja
-
-          # Cleanup.
-          cd $LibrariesPath/tg_owt
-          mv out/Debug/libtg_owt.a libtg_owt.a
-          rm -rf out
-          mkdir -p out/Debug
-          mv libtg_owt.a out/Debug/libtg_owt.a
+          ./$REPO_NAME/Telegram/build/prepare/mac.sh skip-release silent
 
       - name: Telegram Desktop build.
         if: env.ONLY_CACHE == 'false'
diff --git a/Telegram/SourceFiles/api/api_who_read.cpp b/Telegram/SourceFiles/api/api_who_read.cpp
index 49365d23b1..41934e09df 100644
--- a/Telegram/SourceFiles/api/api_who_read.cpp
+++ b/Telegram/SourceFiles/api/api_who_read.cpp
@@ -202,7 +202,7 @@ bool UpdateUserpics(
 	}
 	auto &was = state->userpics;
 	auto now = std::vector<Userpic>();
-	for (const auto peer : peers) {
+	for (const auto &peer : peers) {
 		if (ranges::contains(now, peer, &Userpic::peer)) {
 			continue;
 		}
diff --git a/Telegram/build/prepare/prepare.py b/Telegram/build/prepare/prepare.py
index 2a3704cd5a..afd469fb3d 100644
--- a/Telegram/build/prepare/prepare.py
+++ b/Telegram/build/prepare/prepare.py
@@ -370,7 +370,7 @@ def runStages():
 stage('patches', """
     git clone https://github.com/desktop-app/patches.git
     cd patches
-    git checkout 01779db1de
+    git checkout 1a1d9e6d2c
 """)
 
 stage('depot_tools', """
@@ -379,13 +379,14 @@ mac:
 """, 'ThirdParty')
 
 stage('gyp', """
+win:
     git clone https://chromium.googlesource.com/external/gyp
     cd gyp
     git checkout d6c5dd51dc
 depends:patches/gyp.diff
     git apply $LIBS_DIR/patches/gyp.diff
 mac:
-    ./setup.py build
+    python3 -m pip install git+https://github.com/nodejs/gyp-next@v0.10.0
 """, 'ThirdParty')
 
 stage('yasm', """
@@ -748,7 +749,7 @@ depends:patches/mini_chromium.diff
     git checkout d62d6c6556
     cd ../../..
 
-    build/gyp_crashpad.py -Dmac_deployment_target=10.10 
+    python3 build/gyp_crashpad.py -Dmac_deployment_target=10.10
     ninja -C out/Debug base crashpad_util crashpad_client crashpad_handler
 release:
     ninja -C out/Release base crashpad_util crashpad_client crashpad_handler
@@ -873,7 +874,7 @@ win:
 mac:
     MOZJPEG_PATH=$USED_PREFIX/include
     OPUS_PATH=$USED_PREFIX/include/opus
-    FFMPEG_PATH=$USED_PREFIX/include 
+    FFMPEG_PATH=$USED_PREFIX/include
 common:
     mkdir out
     cd out
diff --git a/Telegram/codegen b/Telegram/codegen
index 7bc5339d18..15026c5b6c 160000
--- a/Telegram/codegen
+++ b/Telegram/codegen
@@ -1 +1 @@
-Subproject commit 7bc5339d18d003f430c64ed2c94e11f6569bfc16
+Subproject commit 15026c5b6c5be43edae5c7737dbc011eec486e16