diff --git a/rust/hg-core/Cargo.toml b/rust/hg-core/Cargo.toml
--- a/rust/hg-core/Cargo.toml
+++ b/rust/hg-core/Cargo.toml
@@ -3,7 +3,7 @@ name = "hg-core"
 version = "0.1.0"
 authors = ["Georges Racinet <gracinet@anybox.fr>"]
 description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)"
-edition = "2018"
+edition = "2021"
 
 [lib]
 name = "hg"
diff --git a/rust/hg-cpython/Cargo.toml b/rust/hg-cpython/Cargo.toml
--- a/rust/hg-cpython/Cargo.toml
+++ b/rust/hg-cpython/Cargo.toml
@@ -2,7 +2,7 @@
 name = "hg-cpython"
 version = "0.1.0"
 authors = ["Georges Racinet <gracinet@anybox.fr>"]
-edition = "2018"
+edition = "2021"
 
 [lib]
 name='rusthg'
diff --git a/rust/rhg/Cargo.toml b/rust/rhg/Cargo.toml
--- a/rust/rhg/Cargo.toml
+++ b/rust/rhg/Cargo.toml
@@ -5,7 +5,7 @@ authors = [
     "Antoine Cezar <antoine.cezar@octobus.net>",
     "Raphaël Gomès <raphael.gomes@octobus.net>",
 ]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 atty = "0.2.14"