diff --git a/Cargo.toml b/Cargo.toml
index 86b2123..55567a8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ documentation = "http://docs.rs/tokio-serial"
 readme = "README.md"
 keywords = ["rs232", "serial", "tokio"]
 categories = ["asynchronous", "hardware-support"]
-edition = "2018"
+edition = "2021"
 
 [package.metadata]
 msrv = "1.46.0"
@@ -23,6 +23,7 @@ default = []
 libudev = ["mio-serial/libudev"]
 rt = ["tokio/rt-multi-thread"]
 codec = ["tokio-util/codec", "bytes"]
+serde = ["mio-serial/serde"]
 
 [dependencies.futures]
 version = "0.3"