diff --git a/spec/tester_mongo_rails_6/Gemfile.lock b/spec/tester_mongo_rails_6/Gemfile.lock
index 37d88a81..850e8703 100644
--- a/spec/tester_mongo_rails_6/Gemfile.lock
+++ b/spec/tester_mongo_rails_6/Gemfile.lock
@@ -149,7 +149,7 @@ GEM
       mongo (>= 2.18.0, < 3.0.0)
     msgpack (1.7.3)
     mutex_m (0.3.0)
-    net-imap (0.6.4)
+    net-imap (0.6.4.1)
       date
       net-protocol
     net-pop (0.1.2)