diff --git a/Gemfile.lock b/Gemfile.lock
index c0b789e..129044a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -178,7 +178,7 @@ GEM
     msgpack (1.7.5)
     net-http (0.6.0)
       uri
-    net-imap (0.5.2)
+    net-imap (0.5.4)
       date
       net-protocol
     net-pop (0.1.2)