diff --git a/metagpt/tools/libs/cr.py b/metagpt/tools/libs/cr.py
index ea6acf654..5fca23a66 100644
--- a/metagpt/tools/libs/cr.py
+++ b/metagpt/tools/libs/cr.py
@@ -85,7 +85,7 @@ class CodeReview:
                     if pre:
                         patch_file_content = pre.text
         else:
-            async with aiofiles.open(patch_path) as f:
+            async with aiofiles.open(patch_path, encoding="utf-8") as f:
                 patch_file_content = await f.read()
                 await EditorReporter().async_report(patch_path)