diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 0ce7998f44..eea4325ce7 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -81,6 +81,7 @@ jobs:
                   cat SUMMARY.md >> docs/SUMMARY.md
 
                   mv element-web/book.toml .
+                  mdbook-mermaid install .
 
             - name: Build docs
               run: mdbook build