diff --git a/serving_utils/saver.py b/serving_utils/saver.py
index cff8fdf..92ea868 100644
--- a/serving_utils/saver.py
+++ b/serving_utils/saver.py
@@ -17,8 +17,8 @@ def __init__(
         self.output_dir = pathlib.Path(output_dir)
         self.output_dir.mkdir(parents=True, exist_ok=True)
 
+    @staticmethod
     def _get_next_version(
-            self,
             path: pathlib.PosixPath,
         ) -> pathlib.PosixPath:
         candidate_paths = path.glob('**/*')
diff --git a/setup.py b/setup.py
index b6ce8b2..93041b5 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@ def run(self):
 
 setup(
     name='serving-utils',
-    version='0.5.1',
+    version='0.5.2',
     description='Some utilities for tensorflow serving',
     long_description=long_description,
     python_requires='>=3.6',