diff --git a/Project.toml b/Project.toml
index 9bb8b30a9..da67a632c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -13,7 +13,7 @@ Symbolics = "0c5d862f-8b57-4792-8d23-62f2024744c7"
 
 [compat]
 Aqua = "0.8"
-ChainRulesCore = "1"
+ChainRulesCore = "1.18"
 ControlSystemsBase = "1"
 DataInterpolations = "4"
 DiffEqBase = "6.133"