diff --git a/Cargo.toml b/Cargo.toml
index 088735e..64706a9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ readme = "README.md"
 keywords = ["priority", "queue", "heap"]
 categories = ["data-structures", "algorithms"]
 license = "LGPL-3.0 OR MPL-2.0"
-edition = "2018"
+edition = "2021"
 
 build = "build.rs"