diff --git a/backend/src/infrastructure/oracle/ranking_repository.py b/backend/src/infrastructure/oracle/ranking_repository.py
index 3fd5766..f83493f 100644
--- a/backend/src/infrastructure/oracle/ranking_repository.py
+++ b/backend/src/infrastructure/oracle/ranking_repository.py
@@ -97,8 +97,8 @@ class RankingOracleRepository:
         if filtro_selos:
             for i, selo in enumerate(filtro_selos):
                 param_name = f"selo_{i}"
-                where_clauses.append(f"((',' || SELOS || ',') LIKE '%,' || :{param_name} || ',%')")
-                params[param_name] = selo
+                where_clauses.append(f"((',' || UPPER(SELOS) || ',') LIKE '%,' || :{param_name} || ',%')")
+                params[param_name] = str(selo).upper()
 
         where_clause = ""
         if where_clauses:
@@ -175,8 +175,8 @@ class RankingOracleRepository:
         if filtro_selos:
             for i, selo in enumerate(filtro_selos):
                 param_name = f"selo_{i}"
-                where_clauses.append(f"((',' || SELOS || ',') LIKE '%,' || :{param_name} || ',%')")
-                params[param_name] = selo
+                where_clauses.append(f"((',' || UPPER(SELOS) || ',') LIKE '%,' || :{param_name} || ',%')")
+                params[param_name] = str(selo).upper()
 
         where_clause = ""
         if where_clauses:
diff --git a/backend/src/interface/api/routes.py b/backend/src/interface/api/routes.py
index 9854a60..5fbcfcb 100644
--- a/backend/src/interface/api/routes.py
+++ b/backend/src/interface/api/routes.py
@@ -214,7 +214,11 @@ async def ranking_paginado(
     if not oracle_repo:
         raise HTTPException(status_code=503, detail="Oracle não configurado")
 
-    selos_lista = [s.strip() for s in selos.split(",") if s.strip()] if selos else None
+    selos_lista = (
+        [s.strip().upper() for s in selos.split(",") if s.strip()]
+        if selos
+        else None
+    )
 
     total = oracle_repo.contar_total(filtro_ativo=ativo, filtro_selos=selos_lista)
     if total == 0:
diff --git a/frontend/src/services/api.js b/frontend/src/services/api.js
index 5d8aedc..f80f13d 100644
--- a/frontend/src/services/api.js
+++ b/frontend/src/services/api.js
@@ -12,7 +12,12 @@ export const rankingService = {
   async getRanking(page = 1, size = 100, selos = []) {
     const params = { page, size };
     if (selos && selos.length > 0) {
-      params.selos = selos.join(',');
+      const normalizados = selos
+        .map((s) => String(s || '').trim().toUpperCase())
+        .filter(Boolean);
+      if (normalizados.length > 0) {
+        params.selos = normalizados.join(',');
+      }
     }
     const response = await api.get('/ranking/paginado', { params });
     const data = response.data;