diff --git a/test/Project.toml b/test/Project.toml
index 41019f9..1a2d210 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -37,6 +37,7 @@ Documenter = "1.12.0"
 ExplicitImports = "1"
 FiniteDiff = "2.27.0"
 ForwardDiff = "0.10.36, 1"
+ImplicitDifferentiation = "0.9.1"
 JET = "0.9, 0.10, 0.11"
 KrylovKit = "0.10.2"
 LinearAlgebra = "1"