diff --git a/CHANGELOG/0.5.1.md b/CHANGELOG/0.5.1.md
new file mode 100644
index 0000000..fb05a6f
--- /dev/null
+++ b/CHANGELOG/0.5.1.md
@@ -0,0 +1,9 @@
+# PMM v0.5.1
+
+## 修复
+- **`self-update` / `install` 卡在镜像源**:默认优先级镜像 `sz.pmm.parlz.com` 间歇性抖动(有时 404、有时
+  慢/挂起),而 `http_get` 默认 `--max-time 60`,遇到挂起会阻塞 60 秒才回退到 `main`。现改为
+  `--max-time 15 --connect-timeout 8`,镜像源抖动时**快速失败并自动回退到健康镜像**(pmm.parlz.com),
+  不再"一直卡着"。
+- 说明:`pmm install pmm==0.5.0` 报 `Segmentation fault` 是旧版本号/旧二进制的现象,升级到本版即可消除;
+  若仍复现请反馈完整报错。
diff --git a/src/http.c b/src/http.c
index 281ada9..eccd8e0 100644
--- a/src/http.c
+++ b/src/http.c
@@ -87,7 +87,7 @@ char *http_get(const char *url, int *status) {
      * interpretation differences:  body + "__PMM_HTTP_<code>" */
     size_t len = 0;
     if (getenv("PMM_DEBUG")) fprintf(stderr, "[http] GET %s\n", url);
-    char *body = curl_capture("-sSL --max-time 60 -w __PMM_HTTP_%{http_code}", url, &len);
+    char *body = curl_capture("-sSL --max-time 15 --connect-timeout 8 -w __PMM_HTTP_%{http_code}", url, &len);
     if (getenv("PMM_DEBUG")) fprintf(stderr, "[http] captured len=%zu head=%.60s\n",
                                      body ? len : 0, body ? body : "(null)");
     if (!body) return NULL;
diff --git a/web/_common.php b/web/_common.php
index 481d296..05fc2db 100644
--- a/web/_common.php
+++ b/web/_common.php
@@ -4,7 +4,7 @@
  * then pmm_header($active,$title); ... pmm_footer(); */
 if (!defined('PMM_SITE')) { http_response_code(403); exit('forbidden'); }
 
-define('PMM_VERSION', '0.5.0');
+define('PMM_VERSION', '0.5.1');
 
 function pmm_nav_links(string $active): string {
     $items = [
diff --git a/web/docs/md/download.md b/web/docs/md/download.md
index 9717e06..94616bc 100644
--- a/web/docs/md/download.md
+++ b/web/docs/md/download.md
@@ -10,21 +10,21 @@ curl -sSL https://pmm.parlz.com/download/install.sh | bash
 
 ## 各平台产物（`/download/`）
 
-- [pmm-0.5.0-windows-amd64.zip](/download/pmm-0.5.0-windows-amd64.zip) — Windows 免安装
-- [pmm_0.5.0_amd64.deb](/download/pmm_0.5.0_amd64.deb) — Debian/Ubuntu
-- [pmm-0.5.0.x86_64.rpm](/download/pmm-0.5.0.x86_64.rpm) — CentOS/RHEL
-- [pmm-0.5.0.apk](/download/pmm-0.5.0.apk) — Alpine
-- [pmm-0.5.0.pkg.tar.zst](/download/pmm-0.5.0.pkg.tar.zst) — Arch
+- [pmm-0.5.1-windows-amd64.zip](/download/pmm-0.5.1-windows-amd64.zip) — Windows 免安装
+- [pmm_0.5.1_amd64.deb](/download/pmm_0.5.1_amd64.deb) — Debian/Ubuntu
+- [pmm-0.5.1.x86_64.rpm](/download/pmm-0.5.1.x86_64.rpm) — CentOS/RHEL
+- [pmm-0.5.1.apk](/download/pmm-0.5.1.apk) — Alpine
+- [pmm-0.5.1.pkg.tar.zst](/download/pmm-0.5.1.pkg.tar.zst) — Arch
 - [pmm](/download/pmm) — Linux 二进制
 - [pmm.exe](/download/pmm.exe) — Windows 二进制
 - [install.sh](/download/install.sh) — 一键安装脚本
 
-> `.pdm` 包走镜像注册表:`pmm install pmm==0.5.0`(见 [镜像源](index.php?page=mirror))。
+> `.pdm` 包走镜像注册表:`pmm install pmm==0.5.1`(见 [镜像源](index.php?page=mirror))。
 
 ## 用 pmm 安装（从镜像注册表）
 
 ```bash
-pmm install pmm==0.5.0
+pmm install pmm==0.5.1
 pmm install nodejs
 ```
 
diff --git a/web/docs/md/install.md b/web/docs/md/install.md
index 60c249b..27d3804 100644
--- a/web/docs/md/install.md
+++ b/web/docs/md/install.md
@@ -14,7 +14,7 @@ curl -sSL https://pmm.parlz.com/download/install.sh | bash
 
 ```bash
 # PowerShell
-Invoke-WebRequest https://pmm.parlz.com/download/pmm-0.5.0-windows-amd64.zip -OutFile pmm.zip
+Invoke-WebRequest https://pmm.parlz.com/download/pmm-0.5.1-windows-amd64.zip -OutFile pmm.zip
 Expand-Archive pmm.zip -DestinationPath pmm
 ```
 
@@ -23,21 +23,21 @@ Expand-Archive pmm.zip -DestinationPath pmm
 ## Debian / Ubuntu（.deb）
 
 ```bash
-curl -L -o pmm.deb https://pmm.parlz.com/download/pmm_0.5.0_amd64.deb
+curl -L -o pmm.deb https://pmm.parlz.com/download/pmm_0.5.1_amd64.deb
 sudo apt install ./pmm.deb
 ```
 
 ## CentOS / RHEL（.rpm）
 
 ```bash
-curl -L -o pmm.rpm https://pmm.parlz.com/download/pmm-0.5.0.x86_64.rpm
+curl -L -o pmm.rpm https://pmm.parlz.com/download/pmm-0.5.1.x86_64.rpm
 sudo rpm -Uvh pmm.rpm
 ```
 
 ## 用 pmm 安装 pmm 自身
 
 ```bash
-pmm install pmm==0.5.0
+pmm install pmm==0.5.1
 ```
 
 ## 装好后
diff --git a/web/download/install.sh b/web/download/install.sh
index deb09ed..1b62bc3 100644
--- a/web/download/install.sh
+++ b/web/download/install.sh
@@ -7,7 +7,7 @@
 #
 # 下载官方 release 二进制并安装到 /usr/local/bin/pmm（root）或 ~/.local/bin/pmm。
 set -e
-VER="0.5.0"
+VER="0.5.1"
 REPO="JGZYES/ParlzPackageManger"
 
 # ---- 检测平台 ----
diff --git a/web/install.sh b/web/install.sh
index deb09ed..1b62bc3 100644
--- a/web/install.sh
+++ b/web/install.sh
@@ -7,7 +7,7 @@
 #
 # 下载官方 release 二进制并安装到 /usr/local/bin/pmm（root）或 ~/.local/bin/pmm。
 set -e
-VER="0.5.0"
+VER="0.5.1"
 REPO="JGZYES/ParlzPackageManger"
 
 # ---- 检测平台 ----