diff --git a/mkdocs.yml b/mkdocs.yml
index 88c7d9e7d5ff96d78eac8266c4a978647d2594c6..46187bd47fddadef7720aa2e95cc787f31652a38 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -2,7 +2,7 @@ site_name: IT4Innovations Documentation
 docs_dir: docs.it4i
 site_url: https://docs.it4i.cz/
 extra_css:
-   - src/css.css
+   - src/css.css?id=2018100501
    - https://unpkg.com/mermaid@7.0.5/dist/mermaid.css
 
 extra_javascript: