diff --git a/Gemfile b/Gemfile
index 02f21bc2adfe76a75f5f14ffbe3e8f56436b157a..ae0f83313d32ec104998847a5fbdda567e528911 100644
--- a/Gemfile
+++ b/Gemfile
@@ -36,7 +36,7 @@ group(:test) do
 	gem "minitest"
 	gem "rake"
 	gem "rantly"
-	gem "rubocop"
+	gem "rubocop", "= 0.89.1"
 	gem "simplecov", require: false
 	gem "webmock"
 end