diff --git a/Gemfile.lock b/Gemfile.lock
index d09214b..074fdea 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,7 @@ GEM
     io-console (0.5.11)
     irb (1.4.1)
       reline (>= 0.3.0)
-    minitest (5.15.0)
+    minitest (5.16.3)
     prime (0.1.2)
       forwardable
       singleton