diff --git a/Project.toml b/Project.toml
index 1426cea7f5..fab81a04f7 100644
--- a/Project.toml
+++ b/Project.toml
@@ -30,7 +30,7 @@ Adapt = "3.0"
 ArrayInterface = "3.1, 4, 5, 6"
 CUDA = "3"
 ChainRulesCore = "1.12"
-Functors = "0.3"
+Functors = "0.3, 0.4"
 MLUtils = "0.2, 0.3"
 MacroTools = "0.5"
 NNlib = "0.8.9"