diff --git a/protoc-bin/Cargo.toml b/protoc-bin/Cargo.toml
index 45a941e7b..bfdbd6420 100644
--- a/protoc-bin/Cargo.toml
+++ b/protoc-bin/Cargo.toml
@@ -9,6 +9,7 @@ description = """
 Internal crate to rust-protobuf
 """
 publish = false
+edition = "2021"
 
 [lib]
 doctest = false