diff --git a/nylas/handler/http_client.py b/nylas/handler/http_client.py
index 44aaf4c..0350f1c 100644
--- a/nylas/handler/http_client.py
+++ b/nylas/handler/http_client.py
@@ -134,7 +134,9 @@ def _execute_download_request(
         stream=False,
         overrides=None,
     ) -> Union[bytes, Response, dict]:
-        request = self._build_request("GET", path, headers, query_params, overrides)
+        request = self._build_request(
+            "GET", path, headers, query_params, overrides=overrides
+        )
 
         timeout = self.timeout
         if overrides and overrides.get("timeout"):
diff --git a/tests/handler/test_http_client.py b/tests/handler/test_http_client.py
index 7564e23..111f5cd 100644
--- a/tests/handler/test_http_client.py
+++ b/tests/handler/test_http_client.py
@@ -219,7 +219,6 @@ def test_execute_download_request_override_timeout(
                 "X-Nylas-API-Wrapper": "python",
                 "User-Agent": "Nylas Python SDK 2.0.0 - 1.2.3",
                 "Authorization": "Bearer test-key",
-                "Content-type": "application/json",
             },
             timeout=60,
             stream=False,
diff --git a/tests/resources/test_attachment_download_overrides.py b/tests/resources/test_attachment_download_overrides.py
new file mode 100644
index 0000000..7b05da0
--- /dev/null
+++ b/tests/resources/test_attachment_download_overrides.py
@@ -0,0 +1,76 @@
+from unittest.mock import Mock
+
+import pytest
+import requests
+
+from nylas import Client
+from nylas.models.errors import NylasSdkTimeoutError
+
+
+@pytest.mark.parametrize("method", ["download", "download_bytes"])
+@pytest.mark.parametrize(
+    "overrides",
+    [
+        None,
+        {"api_uri": "https://override.example.test"},
+        {"headers": {"X-Test": "custom"}},
+        {"api_key": "override-key"},
+        {"skip_auth": True},
+        {"timeout": 60},
+    ],
+)
+def test_attachment_download_honors_overrides(method, overrides, monkeypatch):
+    client = Client(api_key="test-key", api_uri="https://api.example.test", timeout=30)
+    response = requests.Response()
+    response.status_code = 200
+    response._content = b"attachment data"
+    request = Mock(return_value=response)
+    monkeypatch.setattr(requests, "request", request)
+
+    result = getattr(client.attachments, method)(
+        "grant-test",
+        "attachment-test",
+        {"message_id": "message-test"},
+        overrides=overrides,
+    )
+
+    options = overrides or {}
+    call = request.call_args
+    assert call.args[0] == "GET"
+    assert call.args[1] == (
+        options.get("api_uri", "https://api.example.test")
+        + "/v3/grants/grant-test/attachments/attachment-test/download?message_id=message-test"
+    )
+    headers = call.kwargs["headers"]
+    if options.get("skip_auth"):
+        assert "Authorization" not in headers
+    else:
+        assert headers["Authorization"] == "Bearer " + options.get(
+            "api_key", "test-key"
+        )
+    if "headers" in options:
+        assert headers["X-Test"] == "custom"
+    assert "Content-type" not in headers
+    assert call.kwargs["timeout"] == options.get("timeout", 30)
+    assert call.kwargs["stream"] is (method == "download")
+    if method == "download":
+        assert result is response
+    else:
+        assert result == b"attachment data"
+
+
+@pytest.mark.parametrize("method", ["download", "download_bytes"])
+def test_download_timeout_preserves_override_url(method, monkeypatch):
+    client = Client(api_key="test-key", api_uri="https://api.example.test")
+    monkeypatch.setattr(
+        requests, "request", Mock(side_effect=requests.exceptions.Timeout)
+    )
+    with pytest.raises(NylasSdkTimeoutError) as error:
+        getattr(client.attachments, method)(
+            "grant-test",
+            "attachment-test",
+            {"message_id": "message-test"},
+            overrides={"api_uri": "https://override.example.test", "timeout": 60},
+        )
+    assert error.value.url.startswith("https://override.example.test/")
+    assert error.value.timeout == 60