diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 1b5b0c8..4b91006 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -25,7 +25,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install build twine sphinx cibuildwheel
+          python -m pip install build twine sphinx cibuildwheel sphinx_rtd_theme
           # pip install -r requirements.txt