diff --git a/go.mod b/go.mod
index a0210a2..fb8cd67 100644
--- a/go.mod
+++ b/go.mod
@@ -5,4 +5,5 @@ go 1.12
 require (
 	github.com/prometheus/client_golang v1.2.1
 	github.com/prometheus/common v0.7.0
+	github.com/stretchr/testify v1.3.0
 )