diff --git a/Gemfile.lock b/Gemfile.lock
index f804c3a..97b3d07 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -122,7 +122,7 @@ GEM
     minitest (5.25.4)
     minitest-ci (3.4.0)
       minitest (>= 5.0.6)
-    net-imap (0.5.2)
+    net-imap (0.5.6)
       date
       net-protocol
     net-pop (0.1.2)