diff --git a/src/rougail/user_data_yaml/__init__.py b/src/rougail/user_data_yaml/__init__.py
index a623f01..f6517d2 100644
--- a/src/rougail/user_data_yaml/__init__.py
+++ b/src/rougail/user_data_yaml/__init__.py
@@ -57,7 +57,9 @@ class RougailUserDataYaml:
             if filename.is_file():
                 self.filenames.append(filename)
             else:
-                for name in sorted(chain(filename.glob('*.yml'), filename.glob('*.yaml'))):
+                for name in sorted(
+                    chain(filename.glob("*.yml"), filename.glob("*.yaml"))
+                ):
                     self.filenames.append(name)
 
         self.file_with_secrets = self.rougailconfig["yaml.file_with_secrets"]
@@ -71,7 +73,7 @@ class RougailUserDataYaml:
     def run(
         self,
     ) -> None:
-        self.yaml = YAML(typ='safe', pure=True)
+        self.yaml = YAML(typ="safe", pure=True)
         user_data = []
         if self.file_with_secrets == "last":
             last_filename_idx = len(self.filenames) - 1