diff --git a/Gemfile.lock b/Gemfile.lock
index a40a1bb5..4fa69ed7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -193,7 +193,7 @@ GEM
     minitest (5.20.0)
     msgpack (1.7.2)
     nested_form (0.3.2)
-    net-imap (0.4.8)
+    net-imap (0.4.9.1)
       date
       net-protocol
     net-pop (0.1.2)