diff --git a/requirements.txt b/requirements.txt
index 7054981..2269ca1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ pbr==2.1.0
 pep8==1.7.0
 Pillow==3.3.1
 posix-ipc==1.0.0
-protobuf==3.2.0
+protobuf==3.18.3
 py==1.4.33
 pycodestyle==2.0.0
 pyflakes==1.2.3