diff --git a/core/__init__.py b/core/__init__.py
index 1988beb..129738c 100644
--- a/core/__init__.py
+++ b/core/__init__.py
@@ -1,3 +1,3 @@
 # zcbot 版本号单一事实源:web/app.py 的 FastAPI version、/healthz 返回、前端展示都引这里。
 # 改版本只动这一行。
-__version__ = "0.26.4"
+__version__ = "0.26.5"
diff --git a/scripts/diag_wecom.py b/scripts/diag_wecom.py
index c161ae6..67570f2 100644
--- a/scripts/diag_wecom.py
+++ b/scripts/diag_wecom.py
@@ -12,11 +12,33 @@
 import os
 import sys
 
-try:
-    from dotenv import find_dotenv, load_dotenv
-    load_dotenv(find_dotenv())
-except Exception:
-    pass
+# 仓库根加入 sys.path(脚本在 scripts/ 下,直跑时 core 在上一级)
+_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+if _ROOT not in sys.path:
+    sys.path.insert(0, _ROOT)
+
+
+def _load_env(path: str) -> None:
+    """加载 .env:优先 python-dotenv,没装则手动解析(只填未设置的 key)。"""
+    try:
+        from dotenv import load_dotenv
+        load_dotenv(path)
+        return
+    except Exception:
+        pass
+    try:
+        with open(path, encoding="utf-8") as f:
+            for line in f:
+                line = line.strip()
+                if not line or line.startswith("#") or "=" not in line:
+                    continue
+                k, v = line.split("=", 1)
+                os.environ.setdefault(k.strip(), v.strip().strip('"').strip("'"))
+    except FileNotFoundError:
+        pass
+
+
+_load_env(os.path.join(_ROOT, ".env"))
 
 from core.wechat import wecom