diff --git a/.drone.yml b/.drone.yml
index 51ccf69..d53d257 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -11,6 +11,7 @@ steps:
   image: python:3.11
   commands:
     - pip install -U pip
+    - pip install pyyaml
     - python clean_language_blocks.py
     - mkdir -p docs/assets docs/overrides docs/stylesheets
     - cp -r docs_en/assets docs/assets || true