diff --git a/Gemfile.lock b/Gemfile.lock
index 9143cca34..7229e3787 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
     docile (1.4.0)
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
-    minitest (5.20.0)
+    minitest (5.21.1)
     rexml (3.2.6)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)