diff --git a/.docker/Dockerfile-ubuntu-20.04-base b/.docker/Dockerfile-ubuntu-20.04-base
index d193850f0..b8392dc7f 100644
--- a/.docker/Dockerfile-ubuntu-20.04-base
+++ b/.docker/Dockerfile-ubuntu-20.04-base
@@ -5,6 +5,7 @@ RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 
 RUN apt-get update && apt-get -y install --no-install-recommends \
         cmake \
+        clang-12 \
         virtualenv \
         rapidjson-dev \
         libfuse2 \
diff --git a/.docker/Dockerfile-ubuntu-20.04-build b/.docker/Dockerfile-ubuntu-20.04-build
index 4e566bb0d..9f5c8a520 100644
--- a/.docker/Dockerfile-ubuntu-20.04-build
+++ b/.docker/Dockerfile-ubuntu-20.04-build
@@ -7,6 +7,10 @@ RUN mkdir /src/build
 # cmake
 RUN cd /src/build && \
         CXXFLAGS=-fno-sized-deallocation cmake \
+        -DUSE_PRECOMPILED_HEADERS=Off \
+        -DUSE_SUBMODULE_BOOST=Off \
+        -DCMAKE_C_COMPILER=clang-12 \
+        -DCMAKE_CXX_COMPILER=clang++-12 \
         -DCMAKE_INSTALL_PREFIX=appdir/usr/ \
         -DCMAKE_PREFIX_PATH=/opt/qt512/lib/cmake \
         -DBUILD_WITH_QTKEYCHAIN=OFF \
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3f7de9e8e..1a3d4f1a8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -304,12 +304,13 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get -y install \
-              gcc-10 \
-              g++-10
+              clang-12
 
+          sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-12 60
+          sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-12 60
           # Prioritize GCC/G++ 10 over default-installed GCC/G++ 9
-          sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-10 60
-          sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 60
+          sudo update-alternatives --install /usr/bin/cc cc /usr/bin/clang 60
+          sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++ 60
 
       - name: Apply Qt patches (Ubuntu)
         if: startsWith(matrix.os, 'ubuntu') && startsWith(matrix.qt-version, '5.')
@@ -327,7 +328,6 @@ jobs:
             -DCMAKE_BUILD_TYPE=Release \
             -DPAJLADA_SETTINGS_USE_BOOST_FILESYSTEM=On \
             -DUSE_PRECOMPILED_HEADERS=OFF \
-            -DUSE_SUBMODULE_BOOST=ON \
             -DCMAKE_EXPORT_COMPILE_COMMANDS=On \
             -DCHATTERINO_LTO="$C2_ENABLE_LTO" \
             -DCHATTERINO_PLUGINS="$C2_PLUGINS" \