diff --git a/Project.toml b/Project.toml
index aa2ac7bd..7ddc7361 100644
--- a/Project.toml
+++ b/Project.toml
@@ -26,7 +26,7 @@ Calculus = "0.5"
 CommonSubexpressions = "0.3"
 DiffResults = "1.1"
 DiffRules = "1.4"
-DiffTests = "0.1"
+DiffTests = "0.1.3"
 LogExpFunctions = "0.3"
 NaNMath = "1"
 Preferences = "1"