diff --git a/Gemfile.lock b/Gemfile.lock
index d4f0b7d66..3a4cad09c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -174,7 +174,7 @@ GEM
     mutex_m (0.2.0)
     net-http (0.4.1)
       uri
-    net-imap (0.4.12)
+    net-imap (0.4.13)
       date
       net-protocol
     net-ping (2.0.8)