diff --git a/Code/requirements-stable.txt b/Code/requirements-stable.txt
index f11b912..b1e39a2 100644
--- a/Code/requirements-stable.txt
+++ b/Code/requirements-stable.txt
@@ -14,7 +14,7 @@ Markdown==3.0.1
 networkx==2.2
 nltk==3.4.5
 numpy==1.16.0
-protobuf==3.6.1
+protobuf==3.18.3
 pyparsing==2.3.1
 PyYAML==5.1
 rdflib==4.2.2