diff --git a/Cargo.lock b/Cargo.lock
index 9322034d..449ddc27 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -223,7 +223,7 @@ dependencies = [
 
 [[package]]
 name = "eax"
-version = "0.4.0-pre"
+version = "0.4.0"
 dependencies = [
  "aead",
  "aes",
diff --git a/eax/CHANGELOG.md b/eax/CHANGELOG.md
index 80014c3b..9638420a 100644
--- a/eax/CHANGELOG.md
+++ b/eax/CHANGELOG.md
@@ -4,6 +4,20 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 0.4.0 (2021-04-29)
+### Added
+- Allow variable tag length ([#231])
+
+### Changed
+- Bump `aead` crate dependency to v0.4 ([#270])
+- Bump `aes` and `ctr` crate dependencies to v0.7 ([#283])
+- Bump `cmac` and `pmac` deps to v0.6 releases ([#285])
+
+[#231]: https://github.com/RustCrypto/AEADs/pull/231
+[#270]: https://github.com/RustCrypto/AEADs/pull/270
+[#283]: https://github.com/RustCrypto/AEADs/pull/283
+[#285]: https://github.com/RustCrypto/AEADs/pull/285
+
 ## 0.3.0 (2020-10-16)
 ### Changed
 - Replace `block-cipher`/`stream-cipher` with `cipher` crate ([#229])
diff --git a/eax/Cargo.toml b/eax/Cargo.toml
index ca73b5a7..ef8a0f8c 100644
--- a/eax/Cargo.toml
+++ b/eax/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "eax"
-version = "0.4.0-pre"
+version = "0.4.0"
 description = """
 Pure Rust implementation of the EAX
 Authenticated Encryption with Associated Data (AEAD) Cipher