diff --git a/Dockerfile b/Dockerfile
index a166aa11b..dc48bb109 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -42,6 +42,7 @@ WORKDIR /home/app/webapp
 RUN mkdir -p vendor/bundle && \
     chown -R app:app . && \
     chmod -R 755 . && \
+    gem update --system && \
     gem install bundler && \
     /sbin/setuser app bundle install --path vendor/bundle
 
diff --git a/config/initializers/_version.rb b/config/initializers/_version.rb
index 7b9d6335b..107efbd90 100644
--- a/config/initializers/_version.rb
+++ b/config/initializers/_version.rb
@@ -1,5 +1,5 @@
 module Lupo
   class Application
-    VERSION = "2.2.1"
+    VERSION = "2.2.2"
   end
 end
\ No newline at end of file