diff --git a/builder/Gemfile.lock b/builder/Gemfile.lock
index 9668a91bc9c..b3ba48f8bf5 100644
--- a/builder/Gemfile.lock
+++ b/builder/Gemfile.lock
@@ -152,7 +152,7 @@ GEM
     minitest (5.25.5)
     msgpack (1.8.0)
     mutex_m (0.3.0)
-    net-imap (0.5.8)
+    net-imap (0.5.9)
       date
       net-protocol
     net-pop (0.1.2)