diff --git a/PoliTech/requirements.txt b/PoliTech/requirements.txt
old mode 100755
new mode 100644
index ad4ca20..62017cc
--- a/PoliTech/requirements.txt
+++ b/PoliTech/requirements.txt
@@ -25,7 +25,7 @@ wrapt==1.11.1
 djangorestframework-bulk==0.2.1
 httpie==1.0.2
 coreapi==2.3.3
-PyYAML==5.1
+PyYAML==5.4
 certifi==2019.3.9
 chardet==3.0.4
 coreschema==0.0.4