diff --git a/api/v1/serializers/course.py b/api/v1/serializers/course.py
index 5313688f..30c39c58 100644
--- a/api/v1/serializers/course.py
+++ b/api/v1/serializers/course.py
@@ -412,4 +412,4 @@ class LessonCreateSerializer(serializers.ModelSerializer):
 class LessonSerializer(LessonCreateSerializer):
     course = CourseSerializer()
     cover = ImageObjectSerializer()
-    content = ContentSerializer()
+    content = ContentSerializer(many=True)