diff --git a/rustfmt.toml b/rustfmt.toml
index 20ad52fa9be68..b9ca0f903695c 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -1,3 +1,4 @@
+edition = "2021"
 ignore = [
     # This is where Substrate sources with custom formatting are, don't touch them
     "/substrate",