diff --git a/CHANGELOG.md b/CHANGELOG.md
index e8f6c09..fea469c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.9.0] — 2026-06-22
+
+Adds chat-completions session resume + client-authoritative reconciliation. opencode users get zero-config session continuity via the `X-Session-Id` header fallback. The reconciler now runs foundation's transcript-repair pass before persisting, defending Anthropic's API contract against broken client transcripts (orphaned `tool_use`, ordering violations, incomplete turns).
+
 ### Added
 
 - **Chat-completions session resume via `X-Client-Session-Id`.** When the
diff --git a/pyproject.toml b/pyproject.toml
index 335085b..1a20e76 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = 'amplifier-agent'
-version = '0.8.0'
+version = '0.9.0'
 requires-python = '>=3.12'
 license = 'MIT'
 dependencies = [