diff --git a/Cargo.toml b/Cargo.toml
index d91cb54..d5b118e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ license = "MIT"
 repository = "https://github.com/EdJoPaTo/tui-rs-tree-widget"
 documentation = "https://docs.rs/tui-tree-widget"
 authors = ["EdJoPaTo <tui-tree-widget-rust-crate@edjopato.de>"]
-edition = "2018"
+edition = "2021"
 rust-version = "1.56.1"
 keywords = ["tui", "terminal", "tree", "widget"]
 categories = ["command-line-interface"]