diff --git a/completion_aggregator/__init__.py b/completion_aggregator/__init__.py
index 9da95ec3..e79ccd6a 100644
--- a/completion_aggregator/__init__.py
+++ b/completion_aggregator/__init__.py
@@ -4,6 +4,6 @@
 
 from __future__ import absolute_import, unicode_literals
 
-__version__ = '1.5.24'
+__version__ = '2.0.0'
 
 default_app_config = 'completion_aggregator.apps.CompletionAggregatorAppConfig'  # pylint: disable=invalid-name
diff --git a/completion_aggregator/api/common.py b/completion_aggregator/api/common.py
index 2a10d6b7..d61d47ef 100644
--- a/completion_aggregator/api/common.py
+++ b/completion_aggregator/api/common.py
@@ -86,21 +86,25 @@ class CompletionViewMixin(object):
     course_completion_serializer = None
     block_completion_serializer = None
 
-    @property
-    def authentication_classes(self):  # pragma: no cover
+    def get_authenticators(self):  # pragma: no cover
         """
         Allow users authenticated via OAuth2 or normal session authentication.
         """
-        from openedx.core.lib.api import authentication  # pylint: disable=import-error
+        try:
+            from openedx.core.lib.api.authentication import OAuth2AuthenticationAllowInactiveUser  # pylint: disable=import-error
+            from openedx.core.lib.api.authentication import SessionAuthenticationAllowInactiveUser  # pylint: disable=import-error
+        except ImportError:
+            from edx_rest_framework_extensions.auth.session.authentication import SessionAuthenticationAllowInactiveUser  # pylint: disable=import-error
+
         try:
             from edx_rest_framework_extensions.auth.jwt.authentication import JwtAuthentication  # pylint: disable=import-error
         except ImportError:
             from edx_rest_framework_extensions.authentication import JwtAuthentication  # pylint: disable=import-error
 
         return [
-            JwtAuthentication,
-            authentication.OAuth2AuthenticationAllowInactiveUser,
-            authentication.SessionAuthenticationAllowInactiveUser,
+            JwtAuthentication(),
+            OAuth2AuthenticationAllowInactiveUser(),
+            SessionAuthenticationAllowInactiveUser(),
         ]
 
     @property
diff --git a/completion_aggregator/compat.py b/completion_aggregator/compat.py
index 65619a3e..a311393c 100644
--- a/completion_aggregator/compat.py
+++ b/completion_aggregator/compat.py
@@ -69,7 +69,7 @@ def init_course_blocks(user, root_block_key):
     from openedx.core.djangoapps.content.block_structure.transformers import BlockStructureTransformers  # pylint: disable=import-error
 
     transformers = BlockStructureTransformers(
-        get_course_block_access_transformers() + [AggregatorAnnotationTransformer()]
+        get_course_block_access_transformers(user) + [AggregatorAnnotationTransformer()]
     )
 
     return get_course_blocks(user, root_block_key, transformers)
diff --git a/tests/test_views.py b/tests/test_views.py
index 1a11a83e..783e2939 100644
--- a/tests/test_views.py
+++ b/tests/test_views.py
@@ -200,9 +200,8 @@ def setUp(self):
 
         self.patch_object(
             CompletionViewMixin,
-            'authentication_classes',
-            new_callable=PropertyMock,
-            return_value=[OAuth2Authentication, SessionAuthentication]
+            'get_authenticators',
+            return_value=[OAuth2Authentication(), SessionAuthentication()]
         )
         self.patch_object(
             CompletionViewMixin,
@@ -1087,9 +1086,8 @@ def setUp(self):
 
         self.patch_object(
             CompletionViewMixin,
-            'authentication_classes',
-            new_callable=PropertyMock,
-            return_value=[OAuth2Authentication, SessionAuthentication]
+            'get_authenticators',
+            return_value=[OAuth2Authentication(), SessionAuthentication()]
         )
         self.patch_object(
             CompletionViewMixin,