diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5830d7a..3aa8c0a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## [Unreleased]
 
+## [v0.4.0] - 2026-06-08
+
 ### Added
 
 - `agent-tty batch <session-id>`: run an ordered sequence of input-and-`wait` steps against one session in a single invocation, supplied as a positional JSON array or `--file`. Each step is one verb (`type`, `paste`, `sendKeys`, `run`, or `wait`); every `wait` is anchored to a Wait Baseline (the Event Log sequence after the preceding input step) so it cannot match a stale screen the way a hand-written `run`/`wait`/`send-keys` loop can (ADR 0007). Fail-fast by default with a non-zero exit and a per-step `--json` envelope; `--keep-going` attempts every step. SIGINT/SIGTERM flushes a partial envelope (in-flight step `interrupted`, later steps `not-run`). Adds a new `WAIT_TIMEOUT` error and exit code `11` for timed-out wait steps inside a batch ([#126](https://github.com/coder/agent-tty/pull/126), closes [#123](https://github.com/coder/agent-tty/issues/123)).
diff --git a/package.json b/package.json
index 962bb3d..90346df 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "agent-tty",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "description": "Terminal automation CLI for AI agents and humans",
   "license": "Apache-2.0",
   "keywords": [