diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 4d7b74070..1d1b199ec 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -20,7 +20,6 @@ jobs:
           conda list
       - name: Install package
         run: |
-          apt-get install doxygen
           python3 -m pip install --upgrade pip
           python3 -m pip install .
           python3 -m pip install -U sphinx