diff --git a/Gemfile.lock b/Gemfile.lock
index 194a177..f49806e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -104,7 +104,7 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
     mini_mime (1.1.5)
-    minitest (5.25.2)
+    minitest (5.25.4)
     mocha (2.6.1)
       ruby2_keywords (>= 0.0.5)
     nio4r (2.7.4)