diff --git a/Project.toml b/Project.toml
index 3b23fc97d..176b513de 100644
--- a/Project.toml
+++ b/Project.toml
@@ -32,7 +32,7 @@ ForwardDiff = "0.10"
 LazyArrays = "0.17, 0.18, 0.19, 0.20, 0.21"
 LazyBandedMatrices = "0.3, 0.4, 0.5"
 LoopVectorization = "0.12"
-ModelingToolkit = "4 - 5.20"
+ModelingToolkit = "4 - 5.20, 6"
 NNlib = "0.6, 0.7"
 NonlinearSolve = "0.3.7"
 RuntimeGeneratedFunctions = "0.4, 0.5"