diff --git a/Gemfile.lock b/Gemfile.lock
index 0f97712ad..495b12d2f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -311,7 +311,7 @@ GEM
     nenv (0.3.0)
     net-http (0.5.0)
       uri
-    net-imap (0.5.1)
+    net-imap (0.5.6)
       date
       net-protocol
     net-pop (0.1.2)