diff --git a/clap_derive/Cargo.toml b/clap_derive/Cargo.toml
index 224b58c09db..140abd0b335 100644
--- a/clap_derive/Cargo.toml
+++ b/clap_derive/Cargo.toml
@@ -34,7 +34,7 @@ bench = false
 syn = { version = "1.0.74", features = ["full"] }
 quote = "1.0.9"
 proc-macro2 = "1.0.28"
-heck = "0.3.0"
+heck = "0.4.0"
 proc-macro-error = "1"
 
 [features]