diff --git a/test/Project.toml b/test/Project.toml
index abd6b3b..700d5c6 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -17,6 +17,7 @@ Aqua = "0.8"
 BenchmarkTools = "1"
 DocStringExtensions = "0.9"
 FiniteDifferences = "0.12"
+InverseFunctions = "0.1"
 JET = "0.9,0.10,0.11,0.12"
 LogExpFunctions = "0.3,1"
 Sobol = "1.5"