diff --git a/Gemfile.lock b/Gemfile.lock
index b0397e4e6..a917e8586 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -291,7 +291,7 @@ GEM
     msgpack (1.8.0)
     net-http-persistent (4.0.8)
       connection_pool (>= 2.2.4, < 4)
-    net-imap (0.6.3)
+    net-imap (0.6.4)
       date
       net-protocol
     net-pop (0.1.2)