diff --git a/lib/rbs/collection.rb b/lib/rbs/collection.rb
index 6a5302a01..f1a76bc39 100644
--- a/lib/rbs/collection.rb
+++ b/lib/rbs/collection.rb
@@ -2,6 +2,7 @@
 
 require 'yaml'
 
+require_relative './cli/colored_io'
 require_relative './collection/sources'
 require_relative './collection/config'
 require_relative './collection/config/lockfile'