diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index 1aab92a..448a70a 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -5,7 +5,12 @@ jobs:
     runs-on: host
     steps:
       - name: install python
-        run: apk add --no-cache python3 py3-pip ca-certificates git curl github-cli tar 2>&1 | tail -3; python3 --version; git --version
+        # CHV 测试要的非标准库：py3-yaml（test_chv_gaps /
+        # test_chv_gitea_sync / test_chv_v3_fixes 的 import yaml）、
+        # py3-pillow（阶段 4 diff_shot 逐像素裁剪走 PIL）、
+        # procps（阶段 5 ExecdKillGroupTest 用 ps --ppid 找组内
+        # 子进程，Alpine 自带 busybox ps 不支持 --ppid）。
+        run: apk add --no-cache python3 py3-pip py3-yaml py3-pillow procps ca-certificates git curl github-cli tar 2>&1 | tail -3; python3 --version; git --version
       - name: clone repo
         run: |
           rm -rf src