diff --git a/test/rb/Gemfile b/test/rb/Gemfile
index 8301e44..58c04aa 100644
--- a/test/rb/Gemfile
+++ b/test/rb/Gemfile
@@ -4,3 +4,4 @@
 
 gem "rack", "~> 1.5.2"
 gem "thin", "~> 1.5.0"
+gem "test-unit"