diff --git a/Gemfile.lock b/Gemfile.lock
index 3fe8cdeea..932b48637 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -139,7 +139,7 @@ GEM
     mini_magick (4.12.0)
     mini_mime (1.1.2)
     mini_portile2 (2.8.4)
-    minitest (5.18.1)
+    minitest (5.19.0)
     msgpack (1.7.2)
     net-imap (0.3.6)
       date