diff --git a/site-cookbooks/kosmos-mastodon/recipes/default.rb b/site-cookbooks/kosmos-mastodon/recipes/default.rb
index f8ae051..2e14300 100644
--- a/site-cookbooks/kosmos-mastodon/recipes/default.rb
+++ b/site-cookbooks/kosmos-mastodon/recipes/default.rb
@@ -48,7 +48,7 @@ npm_package "yarn" do
   version "1.6.0"
 end
 
-ruby_version = "2.5.1"
+ruby_version = "2.5.3"
 
 application mastodon_path do
   owner "mastodon"