diff --git a/API/pythonCppAPI/requirements.txt b/API/pythonCppAPI/requirements.txt
old mode 100755
new mode 100644
index a0754b2d..29f608ee
--- a/API/pythonCppAPI/requirements.txt
+++ b/API/pythonCppAPI/requirements.txt
@@ -51,7 +51,7 @@ pptk==0.1.0
 progressbar2==3.42.0
 prometheus-client==0.7.1
 prompt-toolkit==2.0.9
-protobuf==3.8.0
+protobuf==3.15.0
 pycparser==2.19
 pydicom==1.2.2
 Pygments==2.4.2