diff --git a/Cargo.toml b/Cargo.toml
index 4afc90e..3e812fa 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ description = "Bundle the source code of a rust cargo crate in a single source f
 license = "MIT"
 homepage = "https://github.com/lpenz/rust-sourcebundler"
 repository = "https://github.com/lpenz/rust-sourcebundler.git"
-edition = "2018"
+edition = "2021"
 categories = ["command-line-utilities"]
 keywords = ["single-file", "bundle", "merge", "source", "build"]