diff --git a/.sync.yml b/.sync.yml
index 5788acab..c32ce6c5 100644
--- a/.sync.yml
+++ b/.sync.yml
@@ -8,6 +8,7 @@ Gemfile:
   optional:
     ":development":
     - gem: github_changelog_generator
+      version: '= 1.15.2'
 spec/spec_helper.rb:
   mock_with: ":rspec"
   coverage_report: true