diff --git a/Gemfile.lock b/Gemfile.lock
index feb85444..1ae3814c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -131,7 +131,7 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.5)
     mini_portile2 (2.8.4)
-    minitest (5.18.1)
+    minitest (5.19.0)
     net-imap (0.3.6)
       date
       net-protocol