diff --git a/website/Gemfile b/website/Gemfile
index a38589e6..bd1cb0b2 100644
--- a/website/Gemfile
+++ b/website/Gemfile
@@ -8,3 +8,4 @@ gem 'puma'
 gem 'listen'
 gem 'byebug'
 gem 'stackprof'
+gem 'rackup'