diff --git a/Project.toml b/Project.toml
index dab1f6e..d204c63 100644
--- a/Project.toml
+++ b/Project.toml
@@ -12,7 +12,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
 ChainRulesCore = "1"
-Functors = "0.4.9"
+Functors = "0.4.9, 0.5"
 Statistics = "1"
 Zygote = "0.6.40"
 julia = "1.6"