diff --git a/moto/cloudformation/models.py b/moto/cloudformation/models.py
index 864e98a92..242cca1fc 100644
--- a/moto/cloudformation/models.py
+++ b/moto/cloudformation/models.py
@@ -85,9 +85,9 @@ class FakeStack(BaseModel):
     def _parse_template(self):
         yaml.add_multi_constructor('', yaml_tag_constructor)
         try:
-            self.template_dict = yaml.load(self.template)
+            self.template_dict = yaml.load(self.template, Loader=yaml.Loader)
         except yaml.parser.ParserError:
-            self.template_dict = json.loads(self.template)
+            self.template_dict = json.loads(self.template, Loader=yaml.Loader)
 
     @property
     def stack_parameters(self):
diff --git a/tests/test_cloudformation/test_stack_parsing.py b/tests/test_cloudformation/test_stack_parsing.py
index d25c69cf1..d21db2d48 100644
--- a/tests/test_cloudformation/test_stack_parsing.py
+++ b/tests/test_cloudformation/test_stack_parsing.py
@@ -448,8 +448,8 @@ def test_short_form_func_in_yaml_teamplate():
     KeySplit: !Split [A, B]
     KeySub: !Sub A
     """
-    yaml.add_multi_constructor('', yaml_tag_constructor)
-    template_dict = yaml.load(template)
+    yaml.add_multi_constructor('', yaml_tag_constructor, Loader=yaml.Loader)
+    template_dict = yaml.load(template, Loader=yaml.Loader)
     key_and_expects = [
         ['KeyRef', {'Ref': 'foo'}],
         ['KeyB64', {'Fn::Base64': 'valueToEncode'}],
diff --git a/tests/test_kms/test_kms.py b/tests/test_kms/test_kms.py
index 0f7bab4cd..95e39a0e7 100644
--- a/tests/test_kms/test_kms.py
+++ b/tests/test_kms/test_kms.py
@@ -8,8 +8,8 @@ import sure  # noqa
 from moto import mock_kms, mock_kms_deprecated
 from nose.tools import assert_raises
 from freezegun import freeze_time
-from datetime import datetime, timedelta
-from dateutil.tz import tzlocal
+from datetime import datetime
+from dateutil.tz import tzutc
 
 
 @mock_kms_deprecated
@@ -660,7 +660,7 @@ def test_schedule_key_deletion():
                 KeyId=key['KeyMetadata']['KeyId']
             )
             assert response['KeyId'] == key['KeyMetadata']['KeyId']
-            assert response['DeletionDate'] == datetime(2015, 1, 31, 12, 0, tzinfo=tzlocal())
+            assert response['DeletionDate'] == datetime(2015, 1, 31, 12, 0, tzinfo=tzutc())
     else:
         # Can't manipulate time in server mode
         response = client.schedule_key_deletion(
@@ -685,7 +685,7 @@ def test_schedule_key_deletion_custom():
                 PendingWindowInDays=7
             )
             assert response['KeyId'] == key['KeyMetadata']['KeyId']
-            assert response['DeletionDate'] == datetime(2015, 1, 8, 12, 0, tzinfo=tzlocal())
+            assert response['DeletionDate'] == datetime(2015, 1, 8, 12, 0, tzinfo=tzutc())
     else:
         # Can't manipulate time in server mode
         response = client.schedule_key_deletion(
diff --git a/tests/test_s3/test_server.py b/tests/test_s3/test_server.py
index 9c8252a04..b179a2329 100644
--- a/tests/test_s3/test_server.py
+++ b/tests/test_s3/test_server.py
@@ -15,6 +15,7 @@ class AuthenticatedClient(FlaskClient):
     def open(self, *args, **kwargs):
         kwargs['headers'] = kwargs.get('headers', {})
         kwargs['headers']['Authorization'] = "Any authorization header"
+        kwargs['content_length'] = 0    # Fixes content-length complaints.
         return super(AuthenticatedClient, self).open(*args, **kwargs)
 
 
diff --git a/tests/test_s3bucket_path/test_bucket_path_server.py b/tests/test_s3bucket_path/test_bucket_path_server.py
index 434110e87..f6238dd28 100644
--- a/tests/test_s3bucket_path/test_bucket_path_server.py
+++ b/tests/test_s3bucket_path/test_bucket_path_server.py
@@ -13,6 +13,7 @@ class AuthenticatedClient(FlaskClient):
     def open(self, *args, **kwargs):
         kwargs['headers'] = kwargs.get('headers', {})
         kwargs['headers']['Authorization'] = "Any authorization header"
+        kwargs['content_length'] = 0  # Fixes content-length complaints.
         return super(AuthenticatedClient, self).open(*args, **kwargs)