diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80ab5a8..de76535 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+## [0.20.0] - 2026-09-17
+
 ### Breaking
 
 - **The NimbleBrain host extension methods are renamed under the `ai.nimblebrain/` prefix.** `synapse/action` is `ai.nimblebrain/action`, `synapse/request-file` is `ai.nimblebrain/request-file`, and `synapse/keydown` is `ai.nimblebrain/keydown`. Each name is both the method and the identifier a host declares in `hostCapabilities.experimental`, so `NIMBLEBRAIN_EXTENSIONS` lists one name per extension. The prefix names the owner: these are the NimbleBrain host's extensions, and this package implements a client for them.
diff --git a/package.json b/package.json
index 1fad68d..552fc3d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@nimblebrain/synapse",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "description": "Agent-aware app SDK for the MCP ext-apps protocol",
   "type": "module",
   "exports": {
diff --git a/python/CHANGELOG.md b/python/CHANGELOG.md
index a4c7cb3..2d5a993 100644
--- a/python/CHANGELOG.md
+++ b/python/CHANGELOG.md
@@ -8,6 +8,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+## [0.7.0]
+
 `SynapseUI` serves the component once, under the MCP Apps MIME, and every input it
 takes is emitted under its ext-apps `ui.*` key. A server can declare the auth a tool
 needs. The bundled client speaks MCP Apps only, and its `callTool()` rejects when a
diff --git a/python/nimblebrain_synapse/__init__.py b/python/nimblebrain_synapse/__init__.py
index e4429c3..c8b4042 100644
--- a/python/nimblebrain_synapse/__init__.py
+++ b/python/nimblebrain_synapse/__init__.py
@@ -38,4 +38,4 @@
 # independently of the JS one (different cadence, different consumers); the two
 # meet only on the wire protocol. CI keeps this equal to the sibling package.json
 # version (ci.yml build job), so the pin can't silently go stale.
-__client_version__ = "0.19.0"
+__client_version__ = "0.20.0"
diff --git a/python/pyproject.toml b/python/pyproject.toml
index fadf179..f3e9767 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "nimblebrain-synapse"
-version = "0.6.0"
+version = "0.7.0"
 description = "Server half of the Synapse cross-host UI framework: declare one self-contained ui:// component as an MCP extension and render it in ChatGPT (OpenAI Apps SDK), Claude (MCP Apps), and the NimbleBrain runtime."
 readme = "README.md"
 requires-python = ">=3.11"