diff --git a/requires/testing.txt b/requires/testing.txt
index 776ca53..d38f130 100644
--- a/requires/testing.txt
+++ b/requires/testing.txt
@@ -2,3 +2,4 @@ nose>=1.3.7,<2
 coverage>=3.7,<4
 arrow>=0.7.0,<1
 mock>=1.3.0,<2
+codecov>=1.6.3,<2