diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e3e3b6..3b17422 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## v0.4.0 — 2026-07-28
+
 ### Changed
 
 - **BREAKING: the suite now conforms to TRACE v0.2.** `TR-ENV` requires the profile `tag:agentrust-io.com,2026:trace-v0.2` and fails a record carrying the v0.1 identifier. The v0.1 URI named `agentrust.io`, a domain this project never controlled, which RFC 4151 does not permit for a tag URI; see agentrust-io/trace-spec#107. Nothing else about the record format changed, so a producer migrates by updating the profile string and bumping `agentrust-trace` to 0.5.0.
diff --git a/pyproject.toml b/pyproject.toml
index 6fe8009..9955574 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "agentrust-trace-tests"
-version = "0.3.0"
+version = "0.4.0"
 description = "TRACE conformance test suite"
 readme = "README.md"
 license = { text = "Apache-2.0" }