diff --git a/src/dbt_score/__main__.py b/src/dbt_score/__main__.py
index bc7c060..09ef06b 100755
--- a/src/dbt_score/__main__.py
+++ b/src/dbt_score/__main__.py
@@ -18,7 +18,7 @@ def set_logging() -> None:
         handler.setLevel(logging.WARNING)
 
 
-def main():
+def main() -> None:
     """Main entry-point."""
     set_logging()
     cli()
diff --git a/src/dbt_score/config.py b/src/dbt_score/config.py
index 83c27b7..a7d1fc5 100644
--- a/src/dbt_score/config.py
+++ b/src/dbt_score/config.py
@@ -71,7 +71,7 @@ def load(self) -> None:
         if config_file:
             self._load_toml_file(str(config_file))
 
-    def overload(self, values: dict[str, str]) -> None:
+    def overload(self, values: dict[str, Any]) -> None:
         """Overload config with additional values."""
         for key, value in values.items():
             self.set_option(key, value)
diff --git a/src/dbt_score/rule_catalog.py b/src/dbt_score/rule_catalog.py
index 59b436b..2ade4a9 100644
--- a/src/dbt_score/rule_catalog.py
+++ b/src/dbt_score/rule_catalog.py
@@ -106,7 +106,7 @@ def format_rule(rule: Rule) -> str | None:
         return template
 
 
-def display_catalog(config: Config, title: str, format: str):
+def display_catalog(config: Config, title: str, format: str) -> None:
     """Print rules catalog."""
     formatter: Formatter
     if format == "terminal":