diff --git a/docs/Project.toml b/docs/Project.toml
index 1a82e485c..f62ef73aa 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -30,7 +30,7 @@ Documenter = "1"
 DocumenterCitations = "1"
 IncompleteLU = "0.2"
 LinearSolve = "2"
-ModelingToolkit = "8"
+ModelingToolkit = "8, 9"
 NonlinearSolve = "3"
 OrdinaryDiffEq = "6"
 Plots = "1"