diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6970436..0938083 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - [BREAKING] Increased base MSRV to 1.65.
 - [BREAKING] `duplicate!` and `duplicate_item` no longer allow using exclusively global substitutions.
+- Edition increased to 2021.
+- Replaced `proc-macro-error` dependency with `proc-macro2-diagnostics` for printing nice error messages and hints. See [#61](https://github.com/Emoun/duplicate/issues/61).
+- Updated `heck` dependency to version 0.5.
 
 ## [1.0.0] - 2023-03-10
 
diff --git a/Cargo.toml b/Cargo.toml
index 948d0c0..ae402b5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,9 @@
 name = "duplicate"
 version = "0.0.0"
 authors = ["Emad Jacob Maroun <emoun.open@gmail.com>"]
-edition = "2018"
+edition = "2021"
+rust-version = "1.65"
+
 license = "MIT OR Apache-2.0"
 description = "Provides macros for duplication of code with variable substitution."
 repository = "https://github.com/Emoun/duplicate"
@@ -19,12 +21,12 @@ proc-macro = true
 [dependencies]
 proc-macro2-diagnostics = { version = "0.10", optional = true }
 proc-macro2 = { version = "1.0.85", optional = true }
-heck = { version = "0.4.0", optional = true }
+heck = { version = "0.5", optional = true }
 
 [dev-dependencies]
 duplicate_macrotest = "1.0.5"
 doc-comment = "0.3.3"
-serde = "1.0.105, < 1.0.157" # Needed because macrotest's cargo.toml uses 1.0 however fails with < 1.0.105 and >= 1.0.157 (because it uses syn v2)
+serde = "1.0.105" # Needed because macrotest's cargo.toml uses 1.0 however fails with < 1.0.105
 regex = "1.6.0"
 rustversion = "1.0.7"