diff --git a/lib/manager/mix/artifacts.ts b/lib/manager/mix/artifacts.ts
index 48dc61553f44e41b840bf7d5e38a3470853388ff..b8160d722e9499692385e103a255b7e6347ac06a 100644
--- a/lib/manager/mix/artifacts.ts
+++ b/lib/manager/mix/artifacts.ts
@@ -92,7 +92,7 @@ export async function updateArtifacts({
       throw err;
     }
 
-    logger.warn(
+    logger.debug(
       { err, message: err.message, command },
       'Failed to update Mix lock file'
     );