diff --git a/Cargo.toml b/Cargo.toml
index 06fdd5c..208e103 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ readme = "README.md"
 keywords = ["base64", "utf8", "encode", "decode", "no_std"]
 categories = ["encoding"]
 license = "MIT OR Apache-2.0"
-edition = "2018"
+edition = "2021"
 rust-version = "1.57.0"
 
 [[bench]]