diff --git a/requirements.hexists.txt b/requirements.hexists.txt
index 9996b70..b7cfa0e 100644
--- a/requirements.hexists.txt
+++ b/requirements.hexists.txt
@@ -9,7 +9,7 @@ Markdown==3.0.1
 mock==2.0.0
 numpy==1.16.1
 pbr==5.1.2
-protobuf==3.6.1
+protobuf==3.18.3
 pysqlite3==0.2.0
 six==1.12.0
 tensorflow-gpu==1.12.2