diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index a13bece6..ebba583c 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -18,6 +18,7 @@ jobs:
       - name: Install requirements
         run: |
           conda install -n build -c conda-forge --file requirements/docs.txt --quiet --yes
+          apt-get install python3-sphinx
 
       - name: Install the package
         run: python -m pip install .
diff --git a/requirements/docs.txt b/requirements/docs.txt
index 95ca3c46..661d44df 100644
--- a/requirements/docs.txt
+++ b/requirements/docs.txt
@@ -1,5 +1,4 @@
 make
-sphinx
 sphinx_rtd_theme
 m2r