diff --git a/e2e/unit/api/test_api.py b/e2e/unit/api/test_api.py
index a7c02dc..0de2288 100644
--- a/e2e/unit/api/test_api.py
+++ b/e2e/unit/api/test_api.py
@@ -18,5 +18,38 @@ def test_api_upload_non_audio_file(base_url, upload_folder):
     assert "not allowed" in response.json().get("error", "")
     assert not os.path.exists(expected_filename)
 
+    if os.path.exists(expected_filename):
+        os.remove(expected_filename)
+
+def test_api_upload_mp3_file(base_url, upload_folder):
+    files = {'file': ('test.mp3', io.BytesIO(b'fake mp3 content'))}
+    expected_filename = os.path.join(upload_folder, secure_filename('test.mp3'))
+    response = requests.post(f'{base_url}/', files=files)
+    assert response.status_code == 200
+    assert "uploaded successfully" in response.json().get("message", "")
+    assert os.path.exists(expected_filename)
+
+    if os.path.exists(expected_filename):
+        os.remove(expected_filename)
+
+def test_api_upload_flac_file(base_url, upload_folder):
+    files = {'file': ('test.flac', io.BytesIO(b'fake flac content'))}
+    expected_filename = os.path.join(upload_folder, secure_filename('test.flac'))
+    response = requests.post(f'{base_url}/', files=files)
+    assert response.status_code == 200
+    assert "uploaded successfully" in response.json().get("message", "")
+    assert os.path.exists(expected_filename)
+
+    if os.path.exists(expected_filename):
+        os.remove(expected_filename)
+
+def test_api_upload_m4a_file(base_url, upload_folder):
+    files = {'file': ('test.m4a', io.BytesIO(b'fake m4a content'))}
+    expected_filename = os.path.join(upload_folder, secure_filename('test.m4a'))
+    response = requests.post(f'{base_url}/', files=files)
+    assert response.status_code == 400
+    assert "not allowed" in response.json().get("error", "")
+    assert not os.path.exists(expected_filename)
+
     if os.path.exists(expected_filename):
         os.remove(expected_filename)
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 1a1688b..d84835b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,5 +6,5 @@ Jinja2==3.1.6
 MarkupSafe==3.0.3
 Werkzeug==3.1.8
 gunicorn==26.0.0
-pip==26.1.1
+pip==26.1.2
 packaging==26.2