diff --git a/docs/Project.toml b/docs/Project.toml
index 484fa0be8..533b1105a 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -56,7 +56,7 @@ ForwardDiff = "0.10"
 IncompleteLU = "0.2"
 JLD2 = "0.4"
 JumpProblemLibrary = "0.1"
-ModelingToolkit = "8"
+ModelingToolkit = "8, 9"
 ODEProblemLibrary = "0.1"
 Optimization = "3"
 OptimizationNLopt = "0.1, 0.2"