diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 59f6c9e..1643575
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ html5lib==0.9999999
 Markdown==3.1.1
 mock==3.0.5
 numpy==1.19.3
-protobuf==3.11.3
+protobuf==3.18.3
 pytest==6.2.2
 rdflib==5.0.0
 six==1.14.0