diff --git a/Cargo.toml b/Cargo.toml
index e6b58d1..03c7d3e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,5 +33,5 @@ maintenance = { status = "actively-developed" }
 [dependencies]
 png_pong = "0.7"
 sheep = { version = "0.3", default-features = false }
-heck = "0.3"
+heck = "0.4"
 pix = "0.13"