diff --git a/spec/tester_mongo/Gemfile.lock b/spec/tester_mongo/Gemfile.lock
index 4bc674fa..255e12a1 100644
--- a/spec/tester_mongo/Gemfile.lock
+++ b/spec/tester_mongo/Gemfile.lock
@@ -140,7 +140,7 @@ GEM
       mongo (>= 2.18.0, < 3.0.0)
     msgpack (1.7.5)
     mutex_m (0.3.0)
-    net-imap (0.5.3)
+    net-imap (0.5.4)
       date
       net-protocol
     net-pop (0.1.2)