diff --git a/spec/tester_mongo_rails_6/Gemfile.lock b/spec/tester_mongo_rails_6/Gemfile.lock
index bd3c1f51..ea5c2aff 100644
--- a/spec/tester_mongo_rails_6/Gemfile.lock
+++ b/spec/tester_mongo_rails_6/Gemfile.lock
@@ -99,7 +99,7 @@ GEM
     cgi (0.5.0)
     coderay (1.1.3)
     concurrent-ruby (1.3.5)
-    connection_pool (2.5.4)
+    connection_pool (3.0.2)
     crass (1.0.6)
     date (3.5.1)
     debug (1.9.2)