diff --git a/Gemfile.lock b/Gemfile.lock
index 32dccb3..7e29e5f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -53,7 +53,7 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
     mini_portile2 (2.8.5)
-    minitest (5.20.0)
+    minitest (5.21.1)
     minitest-reporters (1.6.1)
       ansi
       builder