diff --git a/requirements.txt b/requirements.txt
index 0f3479e..c8f0f6e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -58,7 +58,7 @@ pathvalidate==0.16.1
 pbr==4.0.2
 pep8==1.7.0
 Pillow==4.2.1
-protobuf==3.5.2.post1
+protobuf==3.18.3
 pycrypto==2.6.1
 pyflakes==1.0.0
 Pygments==2.2.0