diff --git a/Project.toml b/Project.toml
index 22fe3200e3..3e853a012b 100644
--- a/Project.toml
+++ b/Project.toml
@@ -50,7 +50,7 @@ ChainRulesCore = "1.10"
 Compat = "2.1, 3, 4"
 Dictionaries = "0.4"
 DocStringExtensions = "0.9.3"
-Functors = "0.2, 0.3, 0.4"
+Functors = "0.2, 0.3, 0.4, 0.5"
 HDF5 = "0.14, 0.15, 0.16, 0.17"
 IsApprox = "0.1"
 KrylovKit = "0.4.2, 0.5, 0.6, 0.7"