diff --git a/setup.cfg b/setup.cfg
index e4530d8..efe3c97 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,7 +7,7 @@ url = https://github.com/OpenSourceEconomics/dags
 author = Janoś Gabler, Tobias Raabe
 author_email = janos.gabler@gmail.com
 license = MIT
-license_file = LICENSE
+license_files = LICENSE
 platforms = unix, linux, osx, cygwin, win32
 classifiers =
     Development Status :: 3 - Alpha
@@ -23,7 +23,7 @@ classifiers =
 packages = find:
 install_requires =
     networkx
-python_requires = >=3.7
+python_requires = >=3.8
 include_package_data = True
 package_dir =
     =src
diff --git a/tests/test_dag.py b/tests/test_dag.py
index 7cfdd4a..db3bcf2 100644
--- a/tests/test_dag.py
+++ b/tests/test_dag.py
@@ -19,7 +19,7 @@ def _consumption(working_hours, wage):
     return wage * working_hours
 
 
-def _unrelated(working_hours):  # noqa: ARG001
+def _unrelated(working_hours):
     raise NotImplementedError("This should not be called.")
 
 
diff --git a/tests/test_signature.py b/tests/test_signature.py
index 6f96d44..2ec08ad 100644
--- a/tests/test_signature.py
+++ b/tests/test_signature.py
@@ -6,7 +6,7 @@
 from dags.signature import with_signature
 
 
-@pytest.fixture()
+@pytest.fixture
 def example_signature():
     parameters = [
         inspect.Parameter(name="a", kind=inspect.Parameter.POSITIONAL_OR_KEYWORD),