diff --git a/services/node_importance/requirements.txt b/services/node_importance/requirements.txt
index 07778c7..6c9d960 100644
--- a/services/node_importance/requirements.txt
+++ b/services/node_importance/requirements.txt
@@ -2,5 +2,5 @@ grpcio==1.17.1
 grpcio-tools==1.17.1
 networkx==2.2
 numpy==1.15.4
-protobuf==3.6.1
+protobuf==3.18.3