diff --git a/backend/label_types/serializers.py b/backend/label_types/serializers.py
index 154c6954..67def6e8 100644
--- a/backend/label_types/serializers.py
+++ b/backend/label_types/serializers.py
@@ -1,7 +1,7 @@
 from rest_framework import serializers
 from rest_framework.exceptions import ValidationError
 
-from .models import CategoryType, LabelType, RelationTypeOld, SpanType
+from .models import CategoryType, LabelType, RelationType, SpanType
 
 
 class LabelSerializer(serializers.ModelSerializer):
@@ -54,33 +54,16 @@ class LabelSerializer(serializers.ModelSerializer):
 class CategoryTypeSerializer(LabelSerializer):
     class Meta:
         model = CategoryType
-        fields = (
-            "id",
-            "text",
-            "prefix_key",
-            "suffix_key",
-            "background_color",
-            "text_color",
-        )
+        fields = LabelSerializer.Meta.fields
 
 
 class SpanTypeSerializer(LabelSerializer):
     class Meta:
         model = SpanType
-        fields = (
-            "id",
-            "text",
-            "prefix_key",
-            "suffix_key",
-            "background_color",
-            "text_color",
-        )
-
+        fields = LabelSerializer.Meta.fields
 
-class RelationTypesSerializer(serializers.ModelSerializer):
-    def validate(self, attrs):
-        return super().validate(attrs)
 
+class RelationTypeSerializer(serializers.ModelSerializer):
     class Meta:
-        model = RelationTypeOld
-        fields = ("id", "color", "name")
+        model = RelationType
+        fields = LabelSerializer.Meta.fields
diff --git a/backend/label_types/urls.py b/backend/label_types/urls.py
index 4c60d9c8..f8b5cb25 100644
--- a/backend/label_types/urls.py
+++ b/backend/label_types/urls.py
@@ -21,5 +21,5 @@ urlpatterns = [
     path(route="span-type-upload", view=SpanTypeUploadAPI.as_view(), name="span_type_upload"),
     path(route="relation_types", view=RelationTypeList.as_view(), name="relation_types_list"),
     path(route="relation_type-upload", view=RelationTypeUploadAPI.as_view(), name="relation_type-upload"),
-    path(route="relation_types/<int:relation_type_id>", view=RelationTypeDetail.as_view(), name="relation_type_detail"),
+    path(route="relation_types/<int:label_id>", view=RelationTypeDetail.as_view(), name="relation_type_detail"),
 ]
diff --git a/backend/label_types/views.py b/backend/label_types/views.py
index 81a1445a..875cbc89 100644
--- a/backend/label_types/views.py
+++ b/backend/label_types/views.py
@@ -11,11 +11,11 @@ from rest_framework.response import Response
 from rest_framework.views import APIView
 
 from .exceptions import LabelValidationError
-from .models import CategoryType, LabelType, RelationTypeOld, SpanType
+from .models import CategoryType, LabelType, RelationType, SpanType
 from .serializers import (
     CategoryTypeSerializer,
     LabelSerializer,
-    RelationTypesSerializer,
+    RelationTypeSerializer,
     SpanTypeSerializer,
 )
 from projects.permissions import IsProjectAdmin, IsProjectStaffAndReadOnly
@@ -74,14 +74,14 @@ class SpanTypeDetail(generics.RetrieveUpdateDestroyAPIView):
 
 
 class RelationTypeList(LabelList):
-    model = RelationTypeOld
-    serializer_class = RelationTypesSerializer
+    model = RelationType
+    serializer_class = RelationTypeSerializer
 
 
 class RelationTypeDetail(generics.RetrieveUpdateDestroyAPIView):
-    queryset = RelationTypeOld.objects.all()
-    serializer_class = RelationTypesSerializer
-    lookup_url_kwarg = "relation_type_id"
+    queryset = RelationType.objects.all()
+    serializer_class = RelationTypeSerializer
+    lookup_url_kwarg = "label_id"
     permission_classes = [IsAuthenticated & (IsProjectAdmin | IsProjectStaffAndReadOnly)]
 
 
@@ -116,4 +116,4 @@ class SpanTypeUploadAPI(LabelUploadAPI):
 
 
 class RelationTypeUploadAPI(LabelUploadAPI):
-    serializer_class = RelationTypesSerializer
+    serializer_class = RelationTypeSerializer