diff --git a/src/rapids_dependency_file_generator/_cli.py b/src/rapids_dependency_file_generator/_cli.py
index b507f401..3ff424c1 100644
--- a/src/rapids_dependency_file_generator/_cli.py
+++ b/src/rapids_dependency_file_generator/_cli.py
@@ -148,4 +148,11 @@ def main(argv=None):
     if args.clean:
         delete_existing_files(args.clean)
 
-    make_dependency_files(parsed_config, file_keys, output, matrix, args.prepend_channels, to_stdout)
+    make_dependency_files(
+        parsed_config=parsed_config,
+        file_keys=file_keys,
+        output=output,
+        matrix=matrix,
+        prepend_channels=args.prepend_channels,
+        to_stdout=to_stdout,
+    )
diff --git a/src/rapids_dependency_file_generator/_rapids_dependency_file_generator.py b/src/rapids_dependency_file_generator/_rapids_dependency_file_generator.py
index 724b8ee0..c17f208a 100644
--- a/src/rapids_dependency_file_generator/_rapids_dependency_file_generator.py
+++ b/src/rapids_dependency_file_generator/_rapids_dependency_file_generator.py
@@ -312,13 +312,14 @@ def should_use_specific_entry(matrix_combo: dict[str, str], specific_entry_matri
 
 
 def make_dependency_files(
+    *,
     parsed_config: _config.Config,
     file_keys: list[str],
     output: typing.Union[set[_config.Output], None],
     matrix: typing.Union[dict[str, list[str]], None],
     prepend_channels: list[str],
     to_stdout: bool,
-):
+) -> None:
     """Generate dependency files.
 
     This function iterates over data parsed from a YAML file conforming to the