diff --git a/app/__tests__/api/fetchImage.test.tsx b/app/__tests__/api/fetchImage.test.tsx
index 52620da..4af92a0 100644
--- a/app/__tests__/api/fetchImage.test.tsx
+++ b/app/__tests__/api/fetchImage.test.tsx
@@ -37,7 +37,7 @@ describe('GET /api/fetchImage', () => {
     const response = await GET(mockRequest);
 
     expect(response.body).toEqual({ error: 'Missing URL parameter' });
-    expect(response.init.status).toBe(400);
+    expect(response.status).toBe(400);
   });
 
   it('should fetch an image if URL is provided', async () => {
@@ -48,6 +48,6 @@ describe('GET /api/fetchImage', () => {
     const response = await GET(mockRequest);
 
     expect(response.body).toBeDefined();
-    expect(response.init.headers['Content-Type']).toBe('image/jpeg');
+    expect(response.headers.get('Content-Type')).toBe('image/jpeg');
   });
 });
\ No newline at end of file
diff --git a/app/__tests__/api/sitemap.test.tsx b/app/__tests__/api/sitemap.test.tsx
index f97a5ed..28346d3 100644
--- a/app/__tests__/api/sitemap.test.tsx
+++ b/app/__tests__/api/sitemap.test.tsx
@@ -39,6 +39,6 @@ describe('GET /api/sitemap', () => {
     expect(response.body).toContain('<loc>https://dki.one/privacy-policy</loc>');
     expect(response.body).toContain('<loc>https://dki.one/projects/just-doing-some-testing</loc>');
     expect(response.body).toContain('<loc>https://dki.one/projects/blockchain-based-voting-system</loc>');
-    expect(response.init.headers['Content-Type']).toBe('application/xml');
+    expect(response.headers.get('Content-Type')).toBe('application/xml');
   });
 });
\ No newline at end of file
diff --git a/app/__tests__/sitemap.xml/page.test.tsx b/app/__tests__/sitemap.xml/page.test.tsx
index 7795a35..3d11e4b 100644
--- a/app/__tests__/sitemap.xml/page.test.tsx
+++ b/app/__tests__/sitemap.xml/page.test.tsx
@@ -39,6 +39,6 @@ describe('Sitemap Component', () => {
     expect(response.body).toContain('<loc>https://dki.one/privacy-policy</loc>');
     expect(response.body).toContain('<loc>https://dki.one/projects/just-doing-some-testing</loc>');
     expect(response.body).toContain('<loc>https://dki.one/projects/blockchain-based-voting-system</loc>');
-    expect(response.init.headers['Content-Type']).toBe('application/xml');
+    expect(response.headers.get('Content-Type')).toBe('application/xml');
   });
 });
\ No newline at end of file