diff --git a/Cargo.toml b/Cargo.toml
index 03f6368..bbc0132 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,7 @@ Re-exports of cross-platform types, gathered from libc and winapi
 repository = "https://github.com/dimbleby/rust-c-types"
 documentation = "https://docs.rs/c-types"
 readme = "README.md"
+edition = "2021"
 keywords = ["libc", "winapi"]
 
 [dependencies]