diff --git a/Project.toml b/Project.toml
index 0acac06c..e7f3e438 100644
--- a/Project.toml
+++ b/Project.toml
@@ -24,6 +24,6 @@ Catalyst = "13"
 Catlab = "0.15.5, 0.16"
 GeneralizedGenerated = "0.3"
 LabelledArrays = "1"
-ModelingToolkit = "8"
+ModelingToolkit = "8, 9"
 OrdinaryDiffEq = "6"
 julia = "1.9"