diff --git a/project/pdf2markdown/scripts/pdf2markdown.py b/project/pdf2markdown/scripts/pdf2markdown.py
index a8bdd98..5182542 100644
--- a/project/pdf2markdown/scripts/pdf2markdown.py
+++ b/project/pdf2markdown/scripts/pdf2markdown.py
@@ -343,7 +343,7 @@ def process(self, input_path, save_dir=None, visualize=False, merge2markdown=Fal
                     for extract_res in pdf_extract_res:
                         md_text = self.convert2md(extract_res)
                         md_content.append(md_text)
-                    with open(os.path.join(save_dir, f"{basename}.md"), "w") as f:
+                    with open(os.path.join(save_dir, f"{basename}.md"), "w", encoding="utf-8") as f:
                         f.write("\n\n".join(md_content))
                         
                 if visualize:
diff --git a/pyproject.toml b/pyproject.toml
index e99d062..ce00128 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ dependencies = [
     "pyyaml",
     "frontend",
     "pymupdf",
-    opencv-python = "^4.6.0"
+    "opencv-python>=4.6.0",
     # Add other common dependencies
 ]