diff --git a/Cargo.lock b/Cargo.lock
index 295f45f9..8103283e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -78,7 +78,7 @@ dependencies = [
 
 [[package]]
 name = "dbl"
-version = "0.4.0-rc.2"
+version = "0.4.0"
 dependencies = [
  "hybrid-array",
 ]
diff --git a/dbl/CHANGELOG.md b/dbl/CHANGELOG.md
index 7df886ff..054c17b6 100644
--- a/dbl/CHANGELOG.md
+++ b/dbl/CHANGELOG.md
@@ -4,7 +4,7 @@ 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 (unreleased)
+## 0.4.0 (2025-08-06)
 ### Changed
 - Migrated from `generic-array` to `hybrid-array` ([#944])
 - Edition changed to 2024 and MSRV bumped to 1.85 ([#1149])
diff --git a/dbl/Cargo.toml b/dbl/Cargo.toml
index b08efc0f..8f30a8c4 100644
--- a/dbl/Cargo.toml
+++ b/dbl/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "dbl"
-version = "0.4.0-rc.2"
+version = "0.4.0"
 authors = ["RustCrypto Developers"]
 license = "MIT OR Apache-2.0"
 documentation = "https://docs.rs/dbl"