diff --git a/site-cookbooks/kosmos-mastodon/recipes/default.rb b/site-cookbooks/kosmos-mastodon/recipes/default.rb
index e223f49..f367d28 100644
--- a/site-cookbooks/kosmos-mastodon/recipes/default.rb
+++ b/site-cookbooks/kosmos-mastodon/recipes/default.rb
@@ -44,9 +44,11 @@ end
 package %w(imagemagick ffmpeg libxml2-dev libxslt1-dev file git curl pkg-config
            libprotobuf-dev protobuf-compiler libidn11 libidn11-dev)
 
-node_package %w(yarn)
+node_package "yarn" do
+  version "0.25.2"
+end
 
-ruby_version = "2.4.1"
+ruby_version = "2.4.2"
 
 application mastodon_path do
   owner "mastodon"