diff --git a/package-lock.json b/package-lock.json
index 4f20a3a..83550fa 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8923,17 +8923,6 @@
         }
       }
     },
-    "node_modules/next-intl/node_modules/@swc/helpers": {
-      "version": "0.5.19",
-      "resolved": "https://registry.npmjs.org/@swc/helpers/-/helpers-0.5.19.tgz",
-      "integrity": "sha512-QamiFeIK3txNjgUTNppE6MiG3p7TdninpZu0E0PbqVh1a9FNLT2FRhisaa4NcaX52XVhA5l7Pk58Ft7Sqi/2sA==",
-      "license": "Apache-2.0",
-      "optional": true,
-      "peer": true,
-      "dependencies": {
-        "tslib": "^2.8.0"
-      }
-    },
     "node_modules/next-themes": {
       "version": "0.4.6",
       "resolved": "https://registry.npmjs.org/next-themes/-/next-themes-0.4.6.tgz",
diff --git a/tests/middleware.test.ts b/tests/middleware.test.ts
index 682a350..f804577 100644
--- a/tests/middleware.test.ts
+++ b/tests/middleware.test.ts
@@ -39,7 +39,7 @@ function createMockRequest(url: string) {
 describe("middleware locale runtime config", () => {
   beforeEach(() => {
     vi.resetModules();
-    process.env.NODE_ENV = "production";
+    vi.stubEnv("NODE_ENV", "production");
     delete process.env.SITE_RUNTIME_ORIGIN;
     createMiddlewareMock.mockReset();
     intlHandlerMock.mockReset();
@@ -49,6 +49,7 @@ describe("middleware locale runtime config", () => {
 
   afterEach(() => {
     vi.unstubAllGlobals();
+    vi.unstubAllEnvs();
   });
 
   it("passes the runtime default locale into next-intl middleware", async () => {
diff --git a/vitest.config.ts b/vitest.config.ts
index 897efc6..0b4395e 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -11,6 +11,11 @@ export default defineConfig({
   resolve: { alias },
   esbuild,
   test: {
+    // Root-level (not valid inside a single `projects[]` entry — it's a global
+    // option). One shared integration test database means test files must run
+    // sequentially (never in parallel) so each file's truncation between tests
+    // never races another file's.
+    fileParallelism: false,
     projects: [
       {
         resolve: { alias },
@@ -28,10 +33,6 @@ export default defineConfig({
           name: "integration",
           environment: "node",
           include: ["tests/integration/**/*.test.{ts,tsx}"],
-          // One shared test database. Files run sequentially (never in parallel)
-          // but each in its own worker, so every file gets a fresh database
-          // connection and truncation between tests never races another file.
-          fileParallelism: false,
           globalSetup: ["tests/helpers/global-db-setup.ts"],
           setupFiles: ["tests/helpers/integration-setup.ts"],
           hookTimeout: 60_000,