diff --git a/kubecon-eu-22-demo/rails/app/Gemfile.lock b/kubecon-eu-22-demo/rails/app/Gemfile.lock
index aadd2d4..0b4fc33 100644
--- a/kubecon-eu-22-demo/rails/app/Gemfile.lock
+++ b/kubecon-eu-22-demo/rails/app/Gemfile.lock
@@ -95,7 +95,7 @@ GEM
     listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    loofah (2.17.0)
+    loofah (2.18.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -110,6 +110,8 @@ GEM
     nio4r (2.5.8)
     nokogiri (1.13.6-x86_64-darwin)
       racc (~> 1.4)
+    nokogiri (1.13.6-x86_64-linux)
+      racc (~> 1.4)
     public_suffix (4.0.7)
     puma (5.6.4)
       nio4r (~> 2.0)
@@ -139,7 +141,7 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.4.2)
+    rails-html-sanitizer (1.4.3)
       loofah (~> 2.3)
     railties (6.1.6)
       actionpack (= 6.1.6)
@@ -208,6 +210,7 @@ GEM
 
 PLATFORMS
   x86_64-darwin-19
+  x86_64-linux
 
 DEPENDENCIES
   bootsnap (>= 1.4.4)