diff --git a/apps/api/src/__tests__/auth.test.ts b/apps/api/src/__tests__/auth.test.ts
index 5446a3e..c338680 100644
--- a/apps/api/src/__tests__/auth.test.ts
+++ b/apps/api/src/__tests__/auth.test.ts
@@ -69,9 +69,14 @@ describe("auth init", () => {
   beforeEach(() => {
     dbSelectResult = [];
     vi.clearAllMocks();
+    // Stub fetch so OIDC discovery requests resolve instantly during tests.
+    // Without this, AbortSignal.timeout(5000) in auth.ts races with vitest's
+    // 5000ms default test timeout and causes flaky failures.
+    vi.stubGlobal("fetch", vi.fn().mockResolvedValue({ ok: false, status: 503 }));
   });
 
   afterEach(() => {
+    vi.unstubAllGlobals();
     process.env = { ...originalEnv };
   });
 
diff --git a/src/__tests__/auth.test.ts b/src/__tests__/auth.test.ts
index 7b4db22..cf5ff60 100644
--- a/src/__tests__/auth.test.ts
+++ b/src/__tests__/auth.test.ts
@@ -69,9 +69,14 @@ describe("auth init", () => {
   beforeEach(() => {
     dbSelectResult = [];
     vi.clearAllMocks();
+    // Stub fetch so OIDC discovery requests resolve instantly during tests.
+    // Without this, AbortSignal.timeout(5000) in auth.ts races with vitest's
+    // 5000ms default test timeout and causes flaky failures.
+    vi.stubGlobal("fetch", vi.fn().mockResolvedValue({ ok: false, status: 503 }));
   });
 
   afterEach(() => {
+    vi.unstubAllGlobals();
     process.env = { ...originalEnv };
   });