diff --git a/package.json b/package.json
index 973c243..e360941 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@uschuster/webapp-scaffold",
-  "version": "0.3.2",
+  "version": "0.3.3",
   "description": "Shared build scripts + Vite config factories for webapp-template-derived projects.",
   "type": "module",
   "bin": {
diff --git a/src/core-fetch.ts b/src/core-fetch.ts
index c976ecb..3f6fd34 100644
--- a/src/core-fetch.ts
+++ b/src/core-fetch.ts
@@ -96,7 +96,11 @@ const MUTATING = new Set(['POST', 'PUT', 'PATCH', 'DELETE']);
 
 export function createCoreFetch(opts: CoreFetchOptions = {}): CoreFetch {
     const base = (opts.baseUrl ?? '').replace(/\/$/, '');
-    const fetchImpl = opts.fetchImpl ?? fetch;
+    // Resolve fetch at call time, not construction time, so tests that
+    // `vi.stubGlobal('fetch', ...)` after module import see the stub.
+    const callFetch: typeof fetch = opts.fetchImpl
+        ? opts.fetchImpl
+        : ((...args) => fetch(...(args as Parameters<typeof fetch>))) as typeof fetch;
     const shape: ResponseShape = opts.responseShape ?? 'wrapped';
 
     function wrap(data: unknown, status: number, headers: Headers): unknown {
@@ -129,7 +133,7 @@ export function createCoreFetch(opts: CoreFetchOptions = {}): CoreFetch {
 
         let r: Response;
         try {
-            r = await fetchImpl(`${base}${url}`, {
+            r = await callFetch(`${base}${url}`, {
                 credentials: 'include',
                 ...init,
                 headers,