diff --git a/.github/workflows/site.yml b/.github/workflows/site.yml
index 8fc9204..5fb5051 100644
--- a/.github/workflows/site.yml
+++ b/.github/workflows/site.yml
@@ -29,6 +29,12 @@ jobs:
     uses: jlt-commons/ci-builds/.github/workflows/site.yml@main
     with:
       base-path: /raygui-jlt
+      # v0.3.0 adds a default Contributing page to every project's guide
+      # (docs-engine README, "The default Contributing page"). Pinned
+      # here rather than left on the shared workflow's own default so
+      # this project's build stays reproducible even after that default
+      # moves again.
+      docs-engine-ref: v0.3.0
     permissions:
       contents: read
       pages: write