diff --git a/Gemfile.lock b/Gemfile.lock
index 97248e55..ec8956f9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -291,7 +291,7 @@ GEM
     mutex_m (0.2.0)
     net-http (0.4.1)
       uri
-    net-imap (0.4.19)
+    net-imap (0.4.20)
       date
       net-protocol
     net-pop (0.1.2)