1diff --git i/mkdocs_puml/plugin.py w/mkdocs_puml/plugin.py
2index e9e0f5b..7435327 100644
3--- i/mkdocs_puml/plugin.py
4+++ w/mkdocs_puml/plugin.py
5@@ -221,6 +221,12 @@ class PlantUMLPlugin(BasePlugin[PlantUMLConfig]):
6 # shutil.copy(puml_js, dest_dir)
7 shutil.copytree(static_dir, dest_dir, dirs_exist_ok=True)
8
9+ # Make sure all the files in dest_dir are writable
10+ for root, dirs, files in os.walk(dest_dir):
11+ for file in files:
12+ file_path = Path(root).joinpath(file)
13+ file_path.chmod(0o644)
14+
15 self.storage.save()
16
17 def _replace(self, key: str, content: str) -> str: