diff --git a/website-builder/Dockerfile b/website-builder/Dockerfile
index 13a7c22b..b10ebfbb 100644
--- a/website-builder/Dockerfile
+++ b/website-builder/Dockerfile
@@ -15,7 +15,7 @@ RUN yarn global add @antora/cli@3.0.0-alpha.9 @antora/site-generator-default@3.0
 # Install Rake and Bundler. This is the minimum needed to generate the site ...
 RUN gem install bundler -v "~>1.0" \
     && gem install rdoc -v 6.2.0 \
-    && gem install bundler \
+    && gem install bundler -v 2.4.22 \
     && gem install jekyll -v ">= 3.8.3, < 4.3" \
     && gem install rake