diff --git a/Project.toml b/Project.toml
index edde3ec..8ecf32f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -6,7 +6,7 @@ version = "0.1.3"
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
 
 [compat]
-ChainRulesCore = "0.10.4"
+ChainRulesCore = "0.10.4, 1"
 julia = "1"
 
 [extras]