diff --git a/Gemfile b/Gemfile
index 2f4545939..7c02ce658 100644
--- a/Gemfile
+++ b/Gemfile
@@ -24,6 +24,7 @@ gem 'nokogiri', '>= 1.10.8'
 gem 'rake', '>= 12.3.3'
 gem 'otr-activerecord'
 gem 'sqlite3'
+gem 'rubocop', '~> 0.88.0', require: false
 
 # Geolocation support
 group :geoip do