diff --git a/courses/views.py b/courses/views.py
index b83b8d6..a560fba 100644
--- a/courses/views.py
+++ b/courses/views.py
@@ -1,6 +1,5 @@
-import base64
+import json
 
-import os
 from jwt import DecodeError
 from rest_framework.parsers import MultiPartParser
 
@@ -156,7 +155,7 @@ class UpdateLessonView(APIView):
 
         materials = []
         if not materials_url == '':
-            materials_url_media = base64.b64decode(materials_url).decode("utf-8").split(',')
+            materials_url_media = json.loads(materials_url)
             for material_url_media in materials_url_media:
                 materials.append(material_url_media.split(settings.MEDIA_URL)[1])