diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3ff59c3..dd33abb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
       run: |
         docker run --rm \
         --volume="${{ github.workspace }}:/srv/jekyll" \
-        jekyll/builder:latest /bin/bash -c "chmod 777 /srv/jekyll && jekyll build"
+        jekyll/builder:latest /bin/bash -c "gem install bundler && chmod 777 /srv/jekyll && jekyll build"
         
   css:
     name: Stylelint