diff --git a/Project.toml b/Project.toml
index 9ceaff71f..5591f03c5 100644
--- a/Project.toml
+++ b/Project.toml
@@ -26,7 +26,7 @@ DelayDiffEq = "5.31"
 DiffEqCallbacks = "2.16"
 ForwardDiff = "0.10"
 Hungarian = "0.6, 0.7"
-OrdinaryDiffEq = "~6.60"
+OrdinaryDiffEq = "~6.60, 6"
 RecipesBase = "1"
 Reexport = "1"
 StaticArrays = "1"