diff --git a/Gemfile.lock b/Gemfile.lock
index 8aae5e45..8f3a4cad 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -180,7 +180,7 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.2)
     mini_portile2 (2.8.2)
-    minitest (5.18.0)
+    minitest (5.18.1)
     msgpack (1.7.1)
     net-imap (0.3.6)
       date