diff --git a/Cargo.toml b/Cargo.toml
index e2a05aae..1cbbc6fc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,5 @@
+cargo-features = ["edition2021"]
+
 [package]
 name = "rustlings"
 version = "4.7.1"