diff --git a/config_defaults.yml b/config_defaults.yml
index b0db674b..f0385e19 100644
--- a/config_defaults.yml
+++ b/config_defaults.yml
@@ -536,6 +536,8 @@ Gemfile:
         version: '= 1.16.0'
       - gem: 'rubocop-rspec'
         version: '= 2.19.0'
+      - gem: 'puppet-strings'
+        version: '~> 4.0'
       - gem: 'rb-readline'
         version: '= 0.5.5'
         platforms: