diff --git a/setup.cfg b/setup.cfg
index c434fd4..cbbb7ac 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,7 +7,7 @@ url = https://github.com/pupil-labs/lsl-relay/
 author = Pupil Labs GmbH
 author_email = info@pupil-labs.com
 license = MIT
-license_file = LICENSE
+license_files = LICENSE
 classifiers =
     Development Status :: 5 - Production/Stable
     Intended Audience :: Developers
@@ -29,7 +29,7 @@ install_requires =
     rich
     typing-extensions
     importlib-metadata;python_version<"3.8"
-python_requires = >=3.7
+python_requires = >=3.8
 include_package_data = true
 package_dir =
     =src
diff --git a/src/pupil_labs/lsl_relay/linear_time_model.py b/src/pupil_labs/lsl_relay/linear_time_model.py
index 848b1d9..8c014d7 100644
--- a/src/pupil_labs/lsl_relay/linear_time_model.py
+++ b/src/pupil_labs/lsl_relay/linear_time_model.py
@@ -21,12 +21,10 @@ class TimeAlignmentModels:
     lsl_to_cloud: linear_model.LinearRegression
 
     @overload
-    def to_json(self, path: Union[str, Path]) -> None:
-        ...
+    def to_json(self, path: Union[str, Path]) -> None: ...
 
     @overload
-    def to_json(self, path: None) -> str:
-        ...
+    def to_json(self, path: None) -> str: ...
 
     def to_json(self, path: Union[None, str, Path] = None) -> Optional[str]:
         mapping_parameters = {