diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10ade41..3c4a283 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Breaking
+
+_Wire-format and API breaking changes for the next major release._
+
 ## [Unreleased]
 
 ### Added
diff --git a/Cargo.lock b/Cargo.lock
index 18442c6..074e793 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -953,7 +953,7 @@ checksum = "9844ddc3a6e533d62bba727eb6c28b5d360921d5175e9ff0f1e621a5c590a4d5"
 
 [[package]]
 name = "fips"
-version = "0.3.0-dev"
+version = "0.4.0-dev"
 dependencies = [
  "bech32",
  "bluer",
diff --git a/Cargo.toml b/Cargo.toml
index 9fac7b1..b3d07c3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "fips"
-version = "0.3.0-dev"
+version = "0.4.0-dev"
 edition = "2024"
 description = "A distributed, decentralized network routing protocol for mesh nodes connecting over arbitrary transports"
 license = "MIT"