diff --git a/Gemfile.lock b/Gemfile.lock
index 075c181..73145d2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -224,7 +224,7 @@ GEM
       ruby2_keywords (~> 0.0.1)
     net-http-persistent (4.0.6)
       connection_pool (~> 2.2, >= 2.2.4)
-    net-imap (0.5.12)
+    net-imap (0.6.4)
       date
       net-protocol
     net-pop (0.1.2)