diff --git a/Gemfile.lock b/Gemfile.lock
index 07f264c..8900687 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -149,7 +149,7 @@ GEM
     msgpack (1.7.2)
     mutex_m (0.3.0)
     mysql2 (0.5.6)
-    net-imap (0.4.19)
+    net-imap (0.4.20)
       date
       net-protocol
     net-pop (0.1.2)