diff --git a/Gemfile.lock b/Gemfile.lock
index 0b387ef..6b87860 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -162,7 +162,7 @@ GEM
     msgpack (1.8.0)
     net-http (0.6.0)
       uri
-    net-imap (0.5.6)
+    net-imap (0.5.7)
       date
       net-protocol
     net-pop (0.1.2)