diff --git a/config_defaults.yml b/config_defaults.yml
index 6c1eafd02da5ab0bc873fd3367afb9e3b7b9267d..e2f68ae210c4aaf14ea840ff0eb7b6decaf3ba88 100644
--- a/config_defaults.yml
+++ b/config_defaults.yml
@@ -591,7 +591,7 @@ Gemfile:
       - gem: 'dependency_checker'
         version: '~> 0.2'
       - gem: 'parallel_tests'
-        version: '~> 3.4'
+        version: '= 3.12.1'
       - gem: 'pry'
         version: '~> 0.10'
       - gem: 'simplecov-console'