Forwarded: https://github.com/dholroyd/four-cc/issues/21
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,10 +28,6 @@
 features = ["derive"]
 optional = true
 
-[dependencies.zerocopy]
-version = "0.7.0"
-optional = true
-
 [dev-dependencies.serde_test]
 version = "1.0"