diff --git a/Project.toml b/Project.toml
index 30d4ec0fc..767f3337b 100644
--- a/Project.toml
+++ b/Project.toml
@@ -10,7 +10,7 @@ Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
-ChainRulesCore = "0.10.9"
+ChainRulesCore = "0.10.9, 1"
 ChainRulesTestUtils = "0.7.9"
 Compat = "3.31"
 FiniteDifferences = "0.12.8"