diff --git a/docs/Project.toml b/docs/Project.toml
index 63bdfbefd..d240bb245 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -22,6 +22,7 @@ BenchmarkTools = "1"
 Documenter = "1"
 IncompleteLU = "0.2"
 LinearSolve = "2"
+ModelingToolkit = "8"
 NonlinearSolve = "1, 2"
 NonlinearSolveMINPACK = "0.1"
 SciMLNLSolve = "0.1"