diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fddd8cb..a9c4bf09 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,10 +6,14 @@ Repo: https://github.com/openclaw/acpx
 
 ## Unreleased
 
+## 0.21.1 - 2026-10-26
+
+**Highlights:** Patch four URI security vulnerabilities in development dependencies, update the guarded filesystem runtime, and clarify missing-prompt errors.
+
 ### Fixes
 
-- Docs/prompting: describe what a prompt command does with no prompt text: it exits with code 2 and `Prompt is required` (or `Prompt from stdin is empty`) instead of printing help. Thanks @KrasimirKralev.
 - Dependencies: update the guarded filesystem runtime and development tools; patch four URI normalization and scheme/host confusion vulnerabilities in the development dependency `fast-uri`.
+- Docs/prompting: describe what a prompt command does with no prompt text: it exits with code 2 and `Prompt is required` (or `Prompt from stdin is empty`) instead of printing help. Thanks @KrasimirKralev.
 
 ## 0.21.0 - 2026-10-23
 
diff --git a/package.json b/package.json
index 5b276d26..2814ab5d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "acpx",
-  "version": "0.21.0",
+  "version": "0.21.1",
   "description": "Headless CLI client for the Agent Client Protocol (ACP) — talk to coding agents from the command line",
   "keywords": [
     "acp",