diff --git a/test/downstream/Project.toml b/test/downstream/Project.toml
index 32941e502..21d07c482 100644
--- a/test/downstream/Project.toml
+++ b/test/downstream/Project.toml
@@ -15,7 +15,7 @@ Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 [compat]
 BoundaryValueDiffEq = "5"
 ForwardDiff = "0.10"
-ModelingToolkit = "8.37"
+ModelingToolkit = "8.37, 9"
 NonlinearSolve = "2, 3"
 Optimization = "3"
 OptimizationOptimJL = "0.1, 0.2"