diff --git a/PACS/ndicom_server/requirements.txt b/PACS/ndicom_server/requirements.txt
old mode 100755
new mode 100644
index cad21b80..da7dbd40
--- a/PACS/ndicom_server/requirements.txt
+++ b/PACS/ndicom_server/requirements.txt
@@ -8,7 +8,7 @@ pynetdicom==1.5.0.dev0
 Django==2.2.13
 django_jsonfield==1.4.0
 djangorestframework==3.11.0
-Pillow==7.1.2
+Pillow==8.1.1
 scikit_learn==0.23.1
 google-pasta==0.1.6
 opencv-python==3.4.8.29