diff --git a/platform_plugin_aspects/sinks/serializers.py b/platform_plugin_aspects/sinks/serializers.py
index a8596d9..ca04686 100644
--- a/platform_plugin_aspects/sinks/serializers.py
+++ b/platform_plugin_aspects/sinks/serializers.py
@@ -211,7 +211,7 @@ def get_course_key(self, obj):
 class TagSerializer(BaseSinkSerializer, serializers.ModelSerializer):
     """Serializer for the Tag model."""
 
-    lineage = serializers.CharField(source="get_lineage")
+    lineage = serializers.SerializerMethodField()
 
     class Meta:
         """Meta class for the TagSerializer."""
@@ -228,26 +228,14 @@ class Meta:
             "time_last_dumped",
         ]
 
-
-class TaxonomySerializer(BaseSinkSerializer, serializers.ModelSerializer):
-    """Serializer for the Taxonomy model."""
-
-    class Meta:
-        """Meta class for the TaxonomySerializer."""
-
-        model = get_model("taxonomy")
-        fields = [
-            "id",
-            "name",
-            "dump_id",
-            "time_last_dumped",
-        ]
+    def get_lineage(self, instance):
+        return json.dumps(instance.get_lineage())
 
 
 class ObjectTagSerializer(BaseSinkSerializer, serializers.ModelSerializer):
     """Serializer for the ObjectTag model."""
 
-    lineage = serializers.CharField(source="get_lineage")
+    lineage = serializers.SerializerMethodField()
 
     class Meta:
         """Meta class for the ObjectTagSerializer"""
@@ -264,3 +252,21 @@ class Meta:
             "dump_id",
             "time_last_dumped",
         ]
+
+    def get_lineage(self, instance):
+        return json.dumps(instance.get_lineage())
+
+
+class TaxonomySerializer(BaseSinkSerializer, serializers.ModelSerializer):
+    """Serializer for the Taxonomy model."""
+
+    class Meta:
+        """Meta class for the TaxonomySerializer."""
+
+        model = get_model("taxonomy")
+        fields = [
+            "id",
+            "name",
+            "dump_id",
+            "time_last_dumped",
+        ]