diff --git a/Project.toml b/Project.toml
index aeef0c7..1c1354c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -52,7 +52,7 @@ Lazy = "0.14, 0.15"
 LoopVectorization = "0.8, 0.9, 0.10, 0.11, 0.12"
 MacroTools = "0.5"
 Optim = "0.19, 0.20, 0.21, 0.22, 1.0"
-OrdinaryDiffEq = "5"
+OrdinaryDiffEq = "5, 6.11"
 PolynomialRoots = "0.2, 1.0"
 ProgressMeter = "1.3"
 QuadGK = "2"