diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5bb31798..a0939709 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -66,7 +66,7 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install Doxygen
         run: |
-          wget -qO- "http://doxygen.nl/files/doxygen-1.8.20.linux.bin.tar.gz" | sudo tar --strip-components=1 -xz -C /usr/local
+          wget -qO- "http://doxygen.nl/files/doxygen-1.9.1.linux.bin.tar.gz" | sudo tar --strip-components=1 -xz -C /usr/local
           sudo apt-get install -y libclang-9-dev
       - name: Run Doxygen And Verify Stdout Is Empty
         run: |