diff --git a/Gemfile.lock b/Gemfile.lock
index aae67c8ea..4c231c9a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -192,7 +192,7 @@ GEM
     msgpack (1.7.5)
     multi_xml (0.7.1)
       bigdecimal (~> 3.1)
-    net-imap (0.5.5)
+    net-imap (0.5.6)
       date
       net-protocol
     net-pop (0.1.2)