diff --git a/Cargo.toml b/Cargo.toml
index cbb4bafd..50098342 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ readme = "README.md"
 keywords = ["http", "async", "non-blocking"]
 categories = ["asynchronous", "web-programming", "network-programming"]
 exclude = ["fixtures/**", "ci/**"]
-edition = "2018"
+edition = "2021"
 rust-version = "1.63"
 
 [features]