diff --git a/wkt-build/Cargo.toml b/wkt-build/Cargo.toml
index 44b0a60..4875d0e 100644
--- a/wkt-build/Cargo.toml
+++ b/wkt-build/Cargo.toml
@@ -15,4 +15,4 @@ prost = "0.12.3"
 prost-types = "0.12.3"
 prost-build = "0.12.3"
 quote = "1.0"
-heck = "0.4"
+heck = "0.5"