diff --git a/.drone.yml b/.drone.yml
index 6a961e6..1587f5b 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -9,7 +9,7 @@ steps:
   - name: site
     path: /site
   commands:
-  - pip install -U -r ./requirements.txt
+  - pip install -U -r ./requirements.txt --force-upgrade
   - mkdocs build
   - cp -r site/ /site
   - chmod -R 777 /site