diff --git a/Gemfile.lock b/Gemfile.lock
index 9a22dff..7e3c070 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -204,7 +204,7 @@ GEM
     minitest (6.0.3)
       drb (~> 2.0)
       prism (~> 1.5)
-    net-imap (0.6.3)
+    net-imap (0.6.4)
       date
       net-protocol
     net-pop (0.1.2)