diff --git a/lxc-apps/decidim/decidim.image b/lxc-apps/decidim/decidim.image
index 0458725..85a4b02 100644
--- a/lxc-apps/decidim/decidim.image
+++ b/lxc-apps/decidim/decidim.image
@@ -25,7 +25,9 @@ COPY decidim.image.d
 RUN EOF
     # Install gems required by decidim
     cd /srv/decidim-app
-    bundle update
+    # Hackfix dependency
+    gem install graphql -v 1.9.21
+    bundle install
 
     # Setup delayed job for mail sending
     bin/rails generate delayed_job:active_record