diff --git a/requirements.txt b/requirements.txt
index d2d72930..1800a66b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ mock==2.0.0
 networkx==1.11
 numpy==1.14.5
 pbr==4.0.4
-protobuf==3.6.0
+protobuf==3.18.3
 scikit-learn==0.19.1
 scipy==1.1.0
 six==1.11.0