diff --git a/fake-tcp/Cargo.toml b/fake-tcp/Cargo.toml
index 0ba9cc3..0f1a518 100644
--- a/fake-tcp/Cargo.toml
+++ b/fake-tcp/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "fake-tcp"
 version = "0.1.2"
-edition = "2018"
+edition = "2021"
 authors = ["Datong Sun <dndx@idndx.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dndx/phantun"
diff --git a/phantun/Cargo.toml b/phantun/Cargo.toml
index ca612b7..66ea879 100644
--- a/phantun/Cargo.toml
+++ b/phantun/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "phantun"
 version = "0.2.1"
-edition = "2018"
+edition = "2021"
 authors = ["Datong Sun <dndx@idndx.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dndx/phantun"