diff --git a/prisma/migrations/20260727120000_normalize_user_social_type_uppercase/migration.sql b/prisma/migrations/20260727120000_normalize_user_social_type_uppercase/migration.sql
new file mode 100644
index 0000000..d2adae0
--- /dev/null
+++ b/prisma/migrations/20260727120000_normalize_user_social_type_uppercase/migration.sql
@@ -0,0 +1,6 @@
+-- Backfill: legacy rows had lowercase social_type ('google', 'naver', 'kakao').
+-- Current write paths (config/social/*.ts, auth.service.ts) always store uppercase,
+-- so this one-shot normalization aligns historical data with the code contract.
+UPDATE `User`
+SET `social_type` = UPPER(`social_type`)
+WHERE `social_type` IN ('google', 'naver', 'kakao');
diff --git a/src/stats/services/admin-stats.service.ts b/src/stats/services/admin-stats.service.ts
index a7cff50..a480b3b 100644
--- a/src/stats/services/admin-stats.service.ts
+++ b/src/stats/services/admin-stats.service.ts
@@ -29,7 +29,7 @@ export const getMemberStats = async (): Promise<MemberStatsResponse> => {
   let total = 0;
 
   for (const row of grouped) {
-    const channel = SOCIAL_TYPE_TO_CHANNEL[row.social_type];
+    const channel = SOCIAL_TYPE_TO_CHANNEL[row.social_type?.toUpperCase()];
     if (!channel) continue;
     byChannel[channel].count = row._count._all;
     total += row._count._all;