diff --git a/apps/api/vitest.config.ts b/apps/api/vitest.config.ts
index 62d9644..5ca3abf 100644
--- a/apps/api/vitest.config.ts
+++ b/apps/api/vitest.config.ts
@@ -5,17 +5,10 @@ export default defineConfig({
     environment: 'node',
     globals: true,
     setupFiles: ['./test/setup.ts'],
-    // Run test files sequentially so concurrent DB tests do not interfere via
-    // the shared MariaDB (global afterEach in test/setup.ts truncates list tables
-    // which causes FK violations if two workers share the DB concurrently).
-    sequence: {
-      concurrent: false,
-    },
-    pool: 'forks',
-    // singleFork: top-level in vitest 4.x (poolOptions removed in v4).
-    // Runs all test files in one forked process so the shared MariaDB
-    // teardown (afterEach in test/setup.ts) never races with inserts
-    // from a concurrent worker.
-    singleFork: true,
+    // Disable parallel file execution so concurrent DB tests do not interfere
+    // via the shared MariaDB. The global afterEach in test/setup.ts truncates
+    // list tables; running test files in parallel causes FK violations when one
+    // file's afterEach deletes rows that another file's test is still using.
+    fileParallelism: false,
   },
 })