diff --git a/example/rails/Gemfile.lock b/example/rails/Gemfile.lock
index 6c90977..b087c5f 100644
--- a/example/rails/Gemfile.lock
+++ b/example/rails/Gemfile.lock
@@ -143,7 +143,7 @@ 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)