diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1712dc19..38e6f308 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -117,6 +117,12 @@
 - **清理**：删除 3.0→3.1、3.1→3.2 跨版本迁移、旧 JWT 与内存会话实现，以及约 70 处无调用方的函数、方法和模型；CI 新增 vulture 死代码检查
 - **修复（版本记录）**：`version.info` 原先只比较次版本号，跨主版本升级（如 3.3 → 4.0）不会被记录；现按完整语义化版本比较
 
+# [3.3.7] - 2026-10-24
+
+3.3.7 只改应用内更新，为 4.0 正式版做准备。
+
+- **变更（应用内更新）**：「软件更新」只提供与当前镜像主版本相同的版本（3.x），稳定版与测试版渠道都是如此。4.0 的更新包要求 4.0 镜像，在 3.3 镜像上无法应用；升级到 4.0 请更换镜像标签，步骤见 [从 3.3 升级到 4.0](https://www.autobangumi.org/deploy/upgrade-4.0)
+
 # [3.3.6] - 2026-09-19
 
 3.3.6 是问题修复版本，修复 3.3.5 发布后报告的 RSS 匹配、网络、解析与部署问题。
diff --git a/docs/changelog/3.3.md b/docs/changelog/3.3.md
index 1ef2686a..f866fb03 100644
--- a/docs/changelog/3.3.md
+++ b/docs/changelog/3.3.md
@@ -2,6 +2,12 @@
 
 3.3 is the largest AutoBangumi release in a while: a fully async backend architecture, aria2 promoted to a first-class download backend, movie/OVA/special support, per-bangumi release preferences, a hardened security stack, and a WebUI that updates over SSE instead of polling. REST API behavior is backward-compatible; existing databases upgrade automatically through schema v24.
 
+## 3.3.7 — In-app update stays on 3.x
+
+3.3.7 changes only the in-app update, to prepare for the 4.0 stable release.
+
+- **In-app update:** Software Update now offers only versions with the same major version as the image (3.x), on the stable and the beta channel. A 4.0 update bundle needs a 4.0 image and cannot be applied on a 3.3 image. To upgrade to 4.0, change the image tag. See [Upgrade from 3.3 to 4.0](https://www.autobangumi.org/en/deploy/upgrade-4.0).
+
 ## 3.3.6 — RSS matching, proxy, parser, and deployment fixes
 
 3.3.6 is a bugfix release for issues reported after 3.3.5.