diff --git a/API/pythonCppAPI/requirements.txt b/API/pythonCppAPI/requirements.txt
old mode 100755
new mode 100644
index a0754b2d..c1c19d7a
--- a/API/pythonCppAPI/requirements.txt
+++ b/API/pythonCppAPI/requirements.txt
@@ -62,7 +62,7 @@ python-dateutil==2.8.0
 python-utils==2.3.0
 PyWavelets==1.0.3
 pywinpty==0.5.5
-PyYAML==5.1.1
+PyYAML==5.4
 pyzmq==18.0.2
 scikit-image==0.15.0
 scipy==1.3.0