diff --git a/streaming_form_data/targets.py b/streaming_form_data/targets.py
index a399f3a..b816714 100644
--- a/streaming_form_data/targets.py
+++ b/streaming_form_data/targets.py
@@ -1,6 +1,5 @@
 import hashlib
 from pathlib import Path
-import smart_open  # type: ignore
 from typing import Callable, List, Optional
 
 
@@ -164,6 +163,7 @@ class S3Target(BaseTarget):
     S3Target enables chunked uploads to S3 buckets (using smart_open)"""
 
     def __init__(self, file_path, mode, transport_params=None, **kwargs):
+        raise Exception("Nixpkgs: disabled")
         super().__init__(**kwargs)
 
         self._file_path = file_path
diff --git a/tests/test_targets.py b/tests/test_targets.py
index 0cc79ab..78ab40b 100644
--- a/tests/test_targets.py
+++ b/tests/test_targets.py
@@ -2,8 +2,6 @@ import os.path
 import tempfile
 
 import pytest
-from moto import mock_s3
-import boto3
 
 from streaming_form_data.targets import (
     BaseTarget,
@@ -271,6 +269,7 @@ def mock_client():
         yield client
 
 
+@pytest.mark.skip
 def test_s3_upload(mock_client):
     test_key = "test.txt"
     path = f"s3://{BUCKET_NAME}/{test_key}"