diff --git a/site-cookbooks/kosmos-mastodon/recipes/default.rb b/site-cookbooks/kosmos-mastodon/recipes/default.rb
index dc8dbee..7cc1f36 100644
--- a/site-cookbooks/kosmos-mastodon/recipes/default.rb
+++ b/site-cookbooks/kosmos-mastodon/recipes/default.rb
@@ -6,9 +6,9 @@
 #
 # All rights reserved - Do Not Redistribute
 #
-
 include_recipe "kosmos-nodejs"
 include_recipe "kosmos-redis"
+
 node.override['postgresql']['enable_pgdg_apt'] = false
 include_recipe "postgresql::server"
 include_recipe "postgresql::ruby"
@@ -41,8 +41,10 @@ user "mastodon" do
   home mastodon_path
 end
 
-package %w(imagemagick ffmpeg libxml2-dev libxslt1-dev file git curl pkg-config libprotobuf-dev protobuf-compiler)
-node_package %w(yarn) # Used by Rails' assets pipeline
+package %w(imagemagick ffmpeg libxml2-dev libxslt1-dev file git curl pkg-config
+           libprotobuf-dev protobuf-compiler libidn11 libidn11-dev)
+
+node_package %w(yarn)
 
 ruby_version = "2.4.1"
 
@@ -97,6 +99,13 @@ application mastodon_path do
     without %w(development test)
   end
 
+  execute do
+    environment "HOME" => mastodon_path
+    user "mastodon"
+    cwd mastodon_path
+    command "yarn install --pure-lockfile"
+  end
+
   rails do
     migrate true
     rails_env "production"