diff --git a/samples/stamp/atos/Citygo/apache/requirements.txt b/samples/stamp/atos/Citygo/apache/requirements.txt
old mode 100755
new mode 100644
index 2c69e2a5..02188000
--- a/samples/stamp/atos/Citygo/apache/requirements.txt
+++ b/samples/stamp/atos/Citygo/apache/requirements.txt
@@ -1,7 +1,7 @@
 Django==1.10.2
 django-allauth==0.27.0
 django-rest-auth==0.8.1
-djangorestframework==3.4.7
+djangorestframework==3.9.1
 httplib2==0.9.2
 oauth2==1.9.0.post1
 oauthlib==2.0.0