diff --git a/Project.toml b/Project.toml
index 3a4cdfb..8d410e9 100644
--- a/Project.toml
+++ b/Project.toml
@@ -21,7 +21,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 ChainRulesCore = "1"
 DiffResults = "1"
 DiffRules = "1.4"
-DiffTests = "< 0.1.2"
+DiffTests = "0.1"
 ForwardDiff = "0.10, 1"
 FunctionWrappers = "1"
 IrrationalConstants = "0.2"