diff --git a/dockertidy/config.py b/dockertidy/config.py
index f6dedf1..78c2812 100644
--- a/dockertidy/config.py
+++ b/dockertidy/config.py
@@ -19,7 +19,7 @@ config_dir = AppDirs("docker-tidy").user_config_dir
 default_config_file = os.path.join(config_dir, "config.yml")
 
 
-class Config():
+class Config:
     """
     Create an object with all necessary settings.
 
diff --git a/pyproject.toml b/pyproject.toml
index 8088854..5c8c1ab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -126,6 +126,7 @@ ignore = [
     "D203",
     "D212",
     "UP038",
+    "RUF012",
 ]
 line-length = 99
 select = [