diff --git a/.forgejo/workflows/main.yaml b/.forgejo/workflows/main.yaml
index 03786ac..2a564cd 100644
--- a/.forgejo/workflows/main.yaml
+++ b/.forgejo/workflows/main.yaml
@@ -11,7 +11,10 @@ jobs:
     - run: cd-clone-branch
 
     - run: cd-clone-python 'rwx.work/rwx'
-    - run: cd-install-packages 'python3-sphinx'
+    - run: |
+        cd-install-packages \
+        'python3-sphinx' \
+        'python3-sphinx-rtd-theme' \
 
     - run: cd-build-project
     - run: cd-browse-workspace