diff --git a/src/pycalver/config.py b/src/pycalver/config.py
index 585771b..e27161f 100644
--- a/src/pycalver/config.py
+++ b/src/pycalver/config.py
@@ -284,7 +284,7 @@ def parse(ctx: ProjectContext) -> MaybeConfig:
 
         return _parse_config(raw_cfg)
     except ValueError as ex:
-        log.warn(f"Couldn't parse {ctx.config_filepath}: {str(ex)}")
+        log.warning(f"Couldn't parse {ctx.config_filepath}: {str(ex)}")
         return None