diff --git a/Gemfile.lock b/Gemfile.lock
index 8c11683..5381de0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -209,7 +209,7 @@ GEM
     svg-graph (1.0.5)
     term-ansicolor (1.3.2)
       tins (~> 1.0)
-    test-unit (3.1.7)
+    test-unit (3.1.8)
       power_assert
     therubyracer (0.12.2)
       libv8 (~> 3.16.14.0)