diff --git a/backend/app/tests/test_routers.py b/backend/app/tests/test_routers.py
index dcfffce..018c542 100644
--- a/backend/app/tests/test_routers.py
+++ b/backend/app/tests/test_routers.py
@@ -184,15 +184,15 @@ def test_get_newsletter_feed(client: TestClient):
     ns = {"atom": "http://www.w3.org/2005/Atom"}
     links = root.findall("atom:link", ns)
     assert any(
-        link.get("rel") == "alternate" and link.get("href") == "http://localhost:8000/"
+        link.get("rel") == "alternate" and link.get("href") == "http://backend:8000/"
         for link in links
     )
     logo = root.find("atom:logo", ns)
     assert logo is not None
-    assert logo.text == "http://localhost:8000/logo.png"
+    assert logo.text == "http://backend:8000/logo.png"
     icon = root.find("atom:icon", ns)
     assert icon is not None
-    assert icon.text == "http://localhost:8000/favicon.ico"
+    assert icon.text == "http://backend:8000/favicon.ico"
     entry_titles = [
         entry.find("atom:title", ns).text for entry in root.findall("atom:entry", ns)
     ]
diff --git a/backend/app/tests/test_services.py b/backend/app/tests/test_services.py
index 3bb4652..4bc8c75 100644
--- a/backend/app/tests/test_services.py
+++ b/backend/app/tests/test_services.py
@@ -40,9 +40,9 @@ def test_generate_feed(db_session: Session):
     # In a real scenario, you'd use an XML parser to validate structure and content more thoroughly
     assert f"<title>{newsletter.name}</title>" in feed_xml.decode()
     assert f"<id>urn:letterfeed:newsletter:{newsletter.id}</id>" in feed_xml.decode()
-    assert '<link href="http://localhost:8000/" rel="alternate"/>' in feed_xml.decode()
-    assert "<logo>http://localhost:8000/logo.png</logo>" in feed_xml.decode()
-    assert "<icon>http://localhost:8000/favicon.ico</icon>" in feed_xml.decode()
+    assert '<link href="http://backend:8000/" rel="alternate"/>' in feed_xml.decode()
+    assert "<logo>http://backend:8000/logo.png</logo>" in feed_xml.decode()
+    assert "<icon>http://backend:8000/favicon.ico</icon>" in feed_xml.decode()
     assert "<title>First Entry</title>" in feed_xml.decode()
     assert "<title>Second Entry</title>" in feed_xml.decode()
     assert (