diff --git a/docs/Project.toml b/docs/Project.toml
index 3c675eb123..9d9830654a 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -22,7 +22,7 @@ BenchmarkTools = "1.3"
 DifferentialEquations = "7.6"
 Distributions = "0.25"
 Documenter = "0.27"
-ModelingToolkit = "8.33"
+ModelingToolkit = "8.33, 9"
 NonlinearSolve = "0.3, 1"
 Optim = "1.7"
 Optimization = "3.9"