diff --git a/docs/Project.toml b/docs/Project.toml
index 800dc7e..a0f6116 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -30,7 +30,7 @@ DifferentialEquations = "7.6"
 Documenter = "0.27"
 GlobalSensitivity = "2"
 JumpProcesses = "9"
-ModelingToolkit = "8"
+ModelingToolkit = "8, 9"
 ModelingToolkitStandardLibrary = "1"
 Plots = "1"
 SciMLWorkshop = "0.1"