diff --git a/Gemfile.lock b/Gemfile.lock
index a0957e0..1dda97c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -134,7 +134,7 @@ GEM
     rubyzip (3.2.2)
     semver2 (3.4.2)
     stringio (3.1.7)
-    test-unit (3.7.1)
+    test-unit (3.7.3)
       power_assert
     thor (1.4.0)
     thread_safe (0.3.6)