diff --git a/.github/workflows/tools-api-docs.yml b/.github/workflows/tools-api-docs.yml
index 403e1e3878..5941842c6a 100644
--- a/.github/workflows/tools-api-docs.yml
+++ b/.github/workflows/tools-api-docs.yml
@@ -19,7 +19,8 @@ jobs:
 
       - name: Install python dependencies
         run: |
-          python -m pip install --upgrade pip Sphinx sphinxcontrib-napoleon
+          pip install --upgrade pip
+          pip install -r ./docs/api/requirements.txt
           pip install .
 
       - name: Build HTML docs
diff --git a/docs/api/requirements.txt b/docs/api/requirements.txt
index e2d91f9b36..3f9531ba3d 100644
--- a/docs/api/requirements.txt
+++ b/docs/api/requirements.txt
@@ -1,2 +1,3 @@
 Sphinx>=3.3.1
+sphinxcontrib-napoleon
 sphinx_rtd_theme>=0.5.0