diff --git a/contracts/dummy/Cargo.toml b/contracts/dummy/Cargo.toml
index debfeba8..1e0f428d 100644
--- a/contracts/dummy/Cargo.toml
+++ b/contracts/dummy/Cargo.toml
@@ -2,7 +2,7 @@
 name = "dummy"
 version = "1.0.0"
 authors = ["Bartek Tofel <tofel.b@gmail.com>"]
-edition = "2018"
+edition = "2021"
 
 exclude = [
   # Those files are rust-optimizer artifacts. You might want to commit them for convenience but they should not be part of the source code publication.