diff --git a/ouroboros/image.py b/ouroboros/image.py
index 3849511d..8baf2155 100644
--- a/ouroboros/image.py
+++ b/ouroboros/image.py
@@ -10,7 +10,7 @@ def check_credentials():
     if environ.get('REPO_USER') and environ.get('REPO_PASS'):
         return {'username': environ['REPO_USER'],
                 'password': environ['REPO_PASS']}
-    return {}
+    return None
 
 
 def pull_latest(image, keep_tag, api_client):
diff --git a/setup.py b/setup.py
index f6bab448..561073bd 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@ def read_reqs(requirements):
 
 setup(
     name='ouroboros-cli',
-    version='0.3.1',
+    version='0.3.2',
     description='Automatically update running docker containers',
     long_description=readme(),
     long_description_content_type='text/markdown',
diff --git a/tests/unit/image_test.py b/tests/unit/image_test.py
index c538205e..81d38055 100644
--- a/tests/unit/image_test.py
+++ b/tests/unit/image_test.py
@@ -4,7 +4,7 @@
 
 
 def test_image_check_credentials_no_env_var():
-    assert image.check_credentials() == {}
+    assert not image.check_credentials()
 
 
 def test_image_check_credentials_env_var(mocker):
@@ -14,7 +14,7 @@ def test_image_check_credentials_env_var(mocker):
 
 def test_image_check_credentials_false_env_var(mocker):
     mocker.patch.dict('os.environ', {'REPO_USR': 'test_user', 'REPO_PaSS': 'test_pass'})
-    assert image.check_credentials() == {}
+    assert not image.check_credentials()
 
 
 def test_image_is_up_to_date():
@@ -32,4 +32,4 @@ def test_remove_exception(mocker, caplog):
 
     image.remove(fake_image, fake_api)
     fake_api.remove_image.assert_called_once_with(fake_image)
-    assert 'Could not clean up image: testcontainer:1.1, reason:' in caplog.text
\ No newline at end of file
+    assert 'Could not clean up image: testcontainer:1.1, reason:' in caplog.text