diff --git a/README.md b/README.md
index aec9af8..ccd7d2a 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,12 @@
 # DSH Runtime Release
 
+## runtime-7.5：精简 MiSans 字重
+
+本次待发布修订为 runtime-7.5，仅保留 MiSans Regular 和 Bold，从第三方 GitHub 仓库 boyan01/mi_sans_font 的固定提交下载独立 TTF 并逐个校验 SHA-256，合计约 15.73 MB，不再下载官方完整 ZIP。构建环境需要能够访问 raw.githubusercontent.com。
+
 ## runtime-7.4：文档工具、中文字体与 Chat Manager 修复
 
-本次待发布修订为 runtime-7.4：新增 Python、LibreOffice、Noto CJK 与 MiSans，并内置修复版 Chat Manager。DSH 版本仍为 0.2.0-rc.2，运行布局仍为 7，继续保留 runtime-7.3 的域名设置适配。已完成本地 AMD64 构建、19 项测试、离线启动及插件接口认证拒绝检查；ARM64 与线上面板完整删除流程尚未验收。
+runtime-7.4 修订内容：新增 Python、LibreOffice、Noto CJK 与 MiSans，并内置修复版 Chat Manager。DSH 版本仍为 0.2.0-rc.2，运行布局仍为 7，继续保留 runtime-7.3 的域名设置适配。已完成本地 AMD64 构建、19 项测试、离线启动及插件接口认证拒绝检查；ARM64 与线上面板完整删除流程尚未验收。
 
 ## 内置修复版 Chat Manager
 
@@ -18,7 +22,7 @@ Runtime 镜像包含 Debian Bookworm 的 Python 3、pip、venv（`python` 指向
 
 这些依赖在镜像构建时安装；已有实例需要重建镜像并升级后才生效。
 
-另包含小米 MiSans 简体中文字体的 10 个静态 TTF 字重，保留 Noto CJK，不修改默认字体优先级。构建时从小米官方下载并校验固定 SHA-256，仅安装原始 TTF 文件；上游包变化会令构建失败，需审核后更新校验值。字体及声明位于 `/usr/local/share/fonts/misans`。MiSans 使用小米专有免费商用许可，并非开源字体许可；安装使用及对外分发镜像前应阅读[官方许可协议](https://hyperos.mi.com/font/zh/download/)，不得单独分发或售卖字体。
+另包含小米 MiSans 简体中文字体的 Regular 和 Bold 两个静态 TTF 字重，保留 Noto CJK，不修改默认字体优先级。构建时从第三方镜像 boyan01/mi_sans_font 的固定提交 68f3ec3fee5830ce8a1d955d462fa0df401a5341 下载两个 TTF 并校验各自 SHA-256；镜像文件与当前官网 ZIP 不同，不保证为最新版本，GitHub 仓库许可不替代小米字体许可。字体及声明位于 `/usr/local/share/fonts/misans`。MiSans 使用小米专有免费商用许可，并非开源字体许可；安装使用及对外分发镜像前应阅读[官方许可协议](https://hyperos.mi.com/font/zh/download/)，不得单独分发或售卖字体。
 
 ## runtime-7.3：域名访问设置适配
 
@@ -32,7 +36,7 @@ Runtime 镜像包含 Debian Bookworm 的 Python 3、pip、venv（`python` 指向
 
 ## 发布清单
 
-`release.json` 是发布入口：`schema_version` 为清单格式版本，`release_id` 标识一次发布，`version` 为精确 DSH 版本，`deployment_schema` 为运行布局版本，`platforms` 为支持的平台。当前待发布配置为 `runtime-7.4`、DSH `0.2.0-rc.2`、布局 7、`linux/amd64` 和 `linux/arm64`（aarch64，不含 32 位 ARM）。
+`release.json` 是发布入口：`schema_version` 为清单格式版本，`release_id` 标识一次发布，`version` 为精确 DSH 版本，`deployment_schema` 为运行布局版本，`platforms` 为支持的平台。当前待发布配置为 `runtime-7.5`、DSH `0.2.0-rc.2`、布局 7、`linux/amd64` 和 `linux/arm64`（aarch64，不含 32 位 ARM）。
 
 ARM64 验收状态：已确认 Node/Caddy 基础镜像提供 ARM64 版本，但尚未完成 ARM64 runtime 构建及运行验收。清单声明会开放面板的对应平台构建入口，不等于兼容性证明；验收完成前不要推送发布。
 
diff --git a/image/MiSans-NOTICE.txt b/image/MiSans-NOTICE.txt
index 17142c7..3bbc05b 100644
--- a/image/MiSans-NOTICE.txt
+++ b/image/MiSans-NOTICE.txt
@@ -1,6 +1,11 @@
 This runtime uses MiSans fonts by Xiaomi.
 Official source: https://hyperos.mi.com/font/zh/download/
-Archive: https://hyperos.mi.com/font-download/MiSans.zip
+Download mirror (third-party, not an official Xiaomi repository):
+https://github.com/boyan01/mi_sans_font/tree/68f3ec3fee5830ce8a1d955d462fa0df401a5341/lib/fonts
+Files: MiSans-Regular.ttf and MiSans-Bold.ttf
+These mirrored files differ from the current official ZIP; they are not claimed
+to be the latest release. The mirror repository's license does not replace the
+Xiaomi font license.
 
 MiSans is subject to the MiSans Fonts Intellectual Property License Agreement
 published on the official download page. It is not an open-source font license.
diff --git a/image/install-misans.mjs b/image/install-misans.mjs
index 8630a77..f11ff55 100644
--- a/image/install-misans.mjs
+++ b/image/install-misans.mjs
@@ -1,33 +1,29 @@
 import { createHash } from 'node:crypto';
-import { mkdtempSync, writeFileSync, rmSync, mkdirSync } from 'node:fs';
-import { tmpdir } from 'node:os';
+import { writeFileSync, mkdirSync } from 'node:fs';
 import { join } from 'node:path';
 import { execFileSync } from 'node:child_process';
 
-const url = 'https://hyperos.mi.com/font-download/MiSans.zip';
-const sha256 = 'b6aa1fc827035922612df8edf36e5609bca1c5441e25cd57572204569b7b81d9';
-const weights = ['Thin', 'ExtraLight', 'Light', 'Normal', 'Regular', 'Medium', 'Demibold', 'Semibold', 'Bold', 'Heavy'];
+// Third-party mirror, pinned to a reviewed commit; Xiaomi's font license applies.
+const base = 'https://raw.githubusercontent.com/boyan01/mi_sans_font/68f3ec3fee5830ce8a1d955d462fa0df401a5341/lib/fonts/';
+const fonts = [
+  ['MiSans-Regular.ttf', '7172aa1b5c703780ee12df3fe4c50481dde01f3b125a045a398000a88d032ae5', 'Regular'],
+  ['MiSans-Bold.ttf', '250fb5c8d4657f103e332b0b948a995e45f2c159beb8d0528424e2d32ae421be', 'Bold'],
+];
 const destination = '/usr/local/share/fonts/misans';
-const temporary = mkdtempSync(join(tmpdir(), 'misans-'));
-try {
-  const response = await fetch(url, { signal: AbortSignal.timeout(300000) });
-  if (!response.ok) throw new Error(`MiSans download failed: ${response.status}`);
-  const archive = Buffer.from(await response.arrayBuffer());
-  if (createHash('sha256').update(archive).digest('hex') !== sha256) {
-    throw new Error('MiSans archive checksum mismatch; review upstream changes before updating');
+mkdirSync(destination, { recursive: true });
+for (const [name, sha256] of fonts) {
+  console.log('Downloading ' + name);
+  const response = await fetch(base + name, { signal: AbortSignal.timeout(120000) });
+  if (!response.ok) throw new Error('MiSans download failed: ' + name + ' HTTP ' + response.status);
+  const font = Buffer.from(await response.arrayBuffer());
+  if (createHash('sha256').update(font).digest('hex') !== sha256) {
+    throw new Error('MiSans checksum mismatch: ' + name);
   }
-  const archivePath = join(temporary, 'MiSans.zip');
-  writeFileSync(archivePath, archive);
-  mkdirSync(destination, { recursive: true });
-  for (const weight of weights) {
-    const name = `MiSans-${weight}.ttf`;
-    // Extract only fixed, reviewed filenames; never unpack arbitrary archive paths.
-    const font = execFileSync('python3', ['-c', 'import sys, zipfile; sys.stdout.buffer.write(zipfile.ZipFile(sys.argv[1]).read(sys.argv[2]))', archivePath, `MiSans/ttf/${name}`], { maxBuffer: 16000000 });
-    writeFileSync(join(destination, name), font, { mode: 0o644 });
-  }
-  execFileSync('fc-cache', ['-f', destination], { stdio: 'inherit' });
-  const family = execFileSync('fc-match', ['-f', '%{family}', 'MiSans'], { encoding: 'utf8' });
-  if (!family.split(',').includes('MiSans')) throw new Error(`MiSans font lookup failed: ${family}`);
-} finally {
-  rmSync(temporary, { recursive: true, force: true });
+  writeFileSync(join(destination, name), font, { mode: 0o644 });
 }
+execFileSync('fc-cache', ['-f', destination], { stdio: 'inherit' });
+for (const [name, , style] of fonts) {
+  const file = execFileSync('fc-match', ['-f', '%{file}', 'MiSans:style=' + style], { encoding: 'utf8' });
+  if (file !== join(destination, name)) throw new Error('MiSans font lookup failed: ' + style + ': ' + file);
+}
+console.log('Installed MiSans Regular and Bold (SHA-256 verified)');
diff --git a/release.json b/release.json
index 2ba2302..1c70953 100644
--- a/release.json
+++ b/release.json
@@ -1,6 +1,6 @@
 {
   "schema_version": 1,
-  "release_id": "runtime-7.4",
+  "release_id": "runtime-7.5",
   "version": "0.2.0-rc.2",
   "deployment_schema": 7,
   "platforms": ["linux/amd64", "linux/arm64"]