diff --git a/site-cookbooks/kosmos-mastodon/recipes/default.rb b/site-cookbooks/kosmos-mastodon/recipes/default.rb
index 143560c..1d12473 100644
--- a/site-cookbooks/kosmos-mastodon/recipes/default.rb
+++ b/site-cookbooks/kosmos-mastodon/recipes/default.rb
@@ -45,10 +45,10 @@ package %w(imagemagick ffmpeg libxml2-dev libxslt1-dev file git curl pkg-config
            libprotobuf-dev protobuf-compiler libidn11 libidn11-dev libjemalloc1)
 
 npm_package "yarn" do
-  version "1.3.2"
+  version "1.6.0"
 end
 
-ruby_version = "2.4.2"
+ruby_version = "2.5.1"
 
 application mastodon_path do
   owner "mastodon"