diff --git a/CHANGELOG.md b/CHANGELOG.md
index a5bfd93..9e0063b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,20 @@
 # Changelog
+## [0.4.0] - 2026-04-05
+
+### Added
+- **Docker image mirroring** — nora mirror docker fetches manifests and blobs from upstream registries (Docker Hub, ghcr.io, etc.) and pushes into NORA (#41)
+- **yarn.lock support** — nora mirror yarn parses v1 format with scoped packages and dedup (#44)
+- **--json output for mirror** — nora mirror npm --json outputs structured JSON for CI/CD pipelines (#43)
+- **Storage size in /health** — total_size_bytes field in health endpoint response (#42)
+- 499 total tests (up from 466), 61.5% code coverage (up from 43%)
+
+### Changed
+- fetch_blob_from_upstream and fetch_manifest_from_upstream are now pub for reuse in mirror module
+
+### Fixed
+- tarpaulin exclude-files paths corrected to workspace-relative (coverage jumped from 29% to 61%) (#92)
+- Env var naming unified across all registries (#39, #90)
+
 ## [0.3.1] - 2026-04-05
 
 ### Added
diff --git a/Cargo.lock b/Cargo.lock
index 9507449..6545c45 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1525,7 +1525,7 @@ dependencies = [
 
 [[package]]
 name = "nora-registry"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "argon2",
  "async-trait",
diff --git a/Cargo.toml b/Cargo.toml
index c756890..8657181 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.3.0"
+version = "0.4.0"
 edition = "2021"
 rust-version = "1.75"
 license = "MIT"