diff --git a/xml_schema_derive/Cargo.toml b/xml_schema_derive/Cargo.toml
index 7b626d3..5b66039 100644
--- a/xml_schema_derive/Cargo.toml
+++ b/xml_schema_derive/Cargo.toml
@@ -20,7 +20,7 @@ default = ["reqwest/default-tls"]
 
 [dependencies]
 darling = "0.20.3"
-heck = "0.4"
+heck = "0.5"
 log = "0.4"
 proc-macro2 = "1.0"
 quote = "1.0"