diff --git a/Project.toml b/Project.toml
index 6dbf0d1d..d03b20e8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -16,7 +16,7 @@ Transducers = "28d57a85-8fef-5791-bfe6-a80928e7c999"
 
 [compat]
 ArgCheck = "1.0, 2.0"
-BangBang = "0.3.17"
+BangBang = "0.3.17, 0.4"
 ConstructionBase = "0.1.0, 1.0"
 InitialValues = "0.2, 0.3"
 MicroCollections = "0.1"