diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4c7b2b5c97f..4d718074293 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -135,9 +135,6 @@ jobs:
         with:
           python-version: '3.8'
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
-
       - name: Download CVAT server image
         uses: actions/download-artifact@v3
         with:
@@ -195,9 +192,6 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
-
       - name: Download CVAT server image
         uses: actions/download-artifact@v3
         with:
@@ -265,9 +259,6 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
-
       - uses: actions/setup-node@v3
         with:
             node-version: '16.x'
diff --git a/Dockerfile.ci b/Dockerfile.ci
index ab01eb72da5..5bd67c12914 100644
--- a/Dockerfile.ci
+++ b/Dockerfile.ci
@@ -1,4 +1,4 @@
-FROM cvat/server
+FROM cvat/server:local
 
 ENV DJANGO_CONFIGURATION=testing
 USER root
diff --git a/cvat/apps/engine/serializers.py b/cvat/apps/engine/serializers.py
index 4256bfa9e28..2c871499475 100644
--- a/cvat/apps/engine/serializers.py
+++ b/cvat/apps/engine/serializers.py
@@ -20,7 +20,7 @@
 from cvat.apps.engine.log import slogger
 from cvat.apps.engine.utils import parse_specific_attributes
 
-from drf_spectacular.utils import OpenApiExample, extend_schema_serializer
+from drf_spectacular.utils import OpenApiExample, extend_schema_field, extend_schema_serializer
 
 class BasicUserSerializer(serializers.ModelSerializer):
     def validate(self, attrs):
@@ -926,6 +926,13 @@ class FrameMetaSerializer(serializers.Serializer):
     name = serializers.CharField(max_length=1024)
     related_files = serializers.IntegerField()
 
+    # for compatibility with version 2.3.0
+    has_related_context = serializers.SerializerMethodField()
+
+    @extend_schema_field(serializers.BooleanField)
+    def get_has_related_context(self, obj: dict) -> bool:
+        return obj['related_files'] != 0
+
 class PluginsSerializer(serializers.Serializer):
     GIT_INTEGRATION = serializers.BooleanField()
     ANALYTICS = serializers.BooleanField()
diff --git a/cvat/apps/iam/tests/test_rest_api.py b/cvat/apps/iam/tests/test_rest_api.py
index 8a309d8af72..acd899c166c 100644
--- a/cvat/apps/iam/tests/test_rest_api.py
+++ b/cvat/apps/iam/tests/test_rest_api.py
@@ -150,7 +150,7 @@ def test_can_report_denial_reason(self):
                 ForceLogin(user=self.user, client=self.client):
             response = self.client.get(self.ENDPOINT_WITH_AUTH)
             self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-            self.assertEqual(response.json(), expected_reasons)
+            self.assertTrue(all([reason in str(response.content) for reason in expected_reasons]))
 
     def test_can_report_merged_denial_reasons(self):
         expected_reasons = [["hello", "world"], ["hi", "there"]]
@@ -159,7 +159,14 @@ def test_can_report_merged_denial_reasons(self):
                 ForceLogin(user=self.user, client=self.client):
             response = self.client.get(self.ENDPOINT_WITH_AUTH)
             self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-            self.assertEqual(response.json(), list(itertools.chain.from_iterable(expected_reasons)))
+            self.assertTrue(
+                all(
+                    [
+                        reason in str(response.content)
+                        for reason in itertools.chain(*expected_reasons)
+                    ]
+                )
+            )
 
     def test_can_allow_if_no_permission_matches(self):
         with self._mock_permissions(), ForceLogin(user=self.user, client=self.client):
@@ -179,4 +186,4 @@ def test_can_deny_if_some_permissions_deny(self):
                 ForceLogin(user=self.user, client=self.client):
             response = self.client.get(self.ENDPOINT_WITH_AUTH)
             self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-            self.assertEqual(response.json(), expected_reasons)
+            self.assertTrue(all([reason in str(response.content) for reason in expected_reasons]))