diff --git a/Project.toml b/Project.toml
index cd497589..baaf970a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -26,7 +26,7 @@ DynamicQuantities = "0.13"
 EarthSciData = "0.9"
 EarthSciMLBase = "0.16"
 Interpolations = "0.14, 0.15"
-ModelingToolkit = "9 - 9.38"
+ModelingToolkit = "9 - 9.38, 9"
 SafeTestsets = "0.0.1, 0.1"
 StaticArrays = "1"
 julia = "1"