diff --git a/alembic/versions/0022_source_per_artist_platform.py b/alembic/versions/0022_source_per_artist_platform.py
index f85b96a..db4e090 100644
--- a/alembic/versions/0022_source_per_artist_platform.py
+++ b/alembic/versions/0022_source_per_artist_platform.py
@@ -109,7 +109,7 @@ def upgrade() -> None:
         by_epid: dict = {}
         for epid, post_id, src_id in all_posts:
             by_epid.setdefault(epid, []).append((post_id, src_id))
-        for epid, posts in by_epid.items():
+        for _epid, posts in by_epid.items():
             if len(posts) <= 1:
                 continue
             # Prefer a Post already under canonical as the keep.