diff --git a/papermill/tests/test_s3.py b/papermill/tests/test_s3.py
index c8ac4f6a..1e4b9e68 100644
--- a/papermill/tests/test_s3.py
+++ b/papermill/tests/test_s3.py
@@ -2,6 +2,7 @@
 
 import os.path
 import pytest
+import boto3
 import moto
 from moto import mock_s3
 
@@ -176,14 +177,14 @@ def test_split_error():
 
 read_from_gen = lambda g: "\n".join(g)
 
-
-@pytest.yield_fixture
+@pytest.yield_fixture(scope="function")
 def s3_client():
     mock_s3 = moto.mock_s3()
     mock_s3.start()
-    import boto3
 
-    client = boto3.client('s3')
+    client = boto3.client('s3',
+        aws_access_key_id='fake',
+        aws_secret_access_key= 'fake')
     client.create_bucket(Bucket=test_bucket_name)
     client.put_object(Bucket=test_bucket_name, Key=test_file_path, Body=test_nb_content)
     yield S3()