diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2281aab..4859016 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,12 @@ from [Conventional Commits](https://www.conventionalcommits.org/).
 
 ## [Unreleased]
 
+## [0.5.0](https://github.com/ForeverAngry/rig-compose/compare/v0.4.3...v0.5.0) - 2026-05-28
+
+### Fixed
+
+- *(tool)* Harden result envelope contract ([#26](https://github.com/ForeverAngry/rig-compose/pull/26))
+
 ### Added
 
 - Add `ToolResultEnvelope` redaction policies, path-aware omitted-segment
diff --git a/Cargo.toml b/Cargo.toml
index 36d3b74..89462a8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rig-compose"
-version = "0.4.3"
+version = "0.5.0"
 edition = "2024"
 rust-version = "1.88"
 authors = ["Brad Cannon <61765732+ForeverAngry@users.noreply.github.com>"]