diff --git a/.github/workflows/doc-build.yml b/.github/workflows/doc-build.yml
index ce1cdbdd9ee..42812ae5199 100644
--- a/.github/workflows/doc-build.yml
+++ b/.github/workflows/doc-build.yml
@@ -30,6 +30,7 @@ env:
   # The latest CMake available directly with apt is 3.18, but we need >=3.20
   # so we fetch that through pip.
   CMAKE_VERSION: 3.20.5
+  DOXYGEN_VERSION: 1.9.1
 
 jobs:
   doc-build-html:
@@ -42,7 +43,10 @@ jobs:
 
     - name: install-pkgs
       run: |
-        sudo apt-get install -y ninja-build doxygen graphviz
+        sudo apt-get install -y ninja-build graphviz libclang1-9 libclang-cpp9
+        wget -q https://www.doxygen.nl/files/doxygen-${DOXYGEN_VERSION}.linux.bin.tar.gz
+        tar xf doxygen-${DOXYGEN_VERSION}.linux.bin.tar.gz
+        echo "${PWD}/doxygen-${DOXYGEN_VERSION}/bin" >> $GITHUB_PATH
 
     - name: cache-pip
       uses: actions/cache@v1