diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97cb75d..ffa6a00 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 Here, we record the addition and removal times of models, major functional updates, bug fixes, and release times of key versions. Each release keeps one brief line here; the per-entry summaries live in `changelog/<version>/README.md`, and every entry links its detail file.
 
+- [2026-07-22] [Version 0.4.1](changelog/0.4.1/README.md): Kimi K3, the Gemini 3.6 generation (gemini-3.6-flash, gemini-3.5-flash-lite), and GLM-5.2 support, a supported-model registry with USD/CNY pricing, context windows, and modalities, and the `UnsupportedParameterError` parameter error class.
+
 - [2026-07-20] [Version 0.4.0](changelog/0.4.0/README.md): the `fidelity` content-item payload replaces `signature`/`phase` (breaking), OpenAI-compatible clients replay the exact upstream reasoning field, Claude 5 support, and hardened tool-call streaming.
 
 - [2026-06-01] [Version 0.3.3](changelog/0.3.3/README.md): OpenAI-compatible embedding input format.
diff --git a/changelog/0.5.0/2026-07-22-kimi-k3-gemini-3-6-registry.md b/changelog/0.4.1/2026-07-22-kimi-k3-gemini-3-6-registry.md
similarity index 100%
rename from changelog/0.5.0/2026-07-22-kimi-k3-gemini-3-6-registry.md
rename to changelog/0.4.1/2026-07-22-kimi-k3-gemini-3-6-registry.md
diff --git a/changelog/0.5.0/README.md b/changelog/0.4.1/README.md
similarity index 94%
rename from changelog/0.5.0/README.md
rename to changelog/0.4.1/README.md
index b315c50..0483d42 100644
--- a/changelog/0.5.0/README.md
+++ b/changelog/0.4.1/README.md
@@ -1,3 +1,3 @@
-# 0.5.0 (unreleased)
+# 0.4.1
 
 - [2026-07-22] Kimi K3, Gemini 3.6 generation (gemini-3.6-flash, gemini-3.5-flash-lite), and GLM-5.2 support, a supported-model registry (`list_supported_models` with USD/CNY pricing, context windows, and modalities), and the `UnsupportedParameterError` parameter error class. ([details](2026-07-22-kimi-k3-gemini-3-6-registry.md))
diff --git a/src_py/pyproject.toml b/src_py/pyproject.toml
index 7697e7c..2a61058 100644
--- a/src_py/pyproject.toml
+++ b/src_py/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "agenthub-python"
-version = "0.4.0"
+version = "0.4.1"
 description = "AgentHub is the LLM API Hub for the Agent era, built for high-precision autonomous agents."
 keywords = ["agent", "llm", "gemini", "claude", "gpt"]
 readme = "README.md"
diff --git a/src_ts/package-lock.json b/src_ts/package-lock.json
index 9107dea..1bd6bb0 100644
--- a/src_ts/package-lock.json
+++ b/src_ts/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@prismshadow/agenthub",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@prismshadow/agenthub",
-      "version": "0.4.0",
+      "version": "0.4.1",
       "license": "Apache-2.0",
       "dependencies": {
         "@anthropic-ai/bedrock-sdk": "^0.26.4",
diff --git a/src_ts/package.json b/src_ts/package.json
index 9260808..58ec840 100644
--- a/src_ts/package.json
+++ b/src_ts/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@prismshadow/agenthub",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "AgentHub is the LLM API Hub for the Agent era, built for high-precision autonomous agents.",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",