diff --git a/pip-requirements.txt b/pip-requirements.txt
index 44dcf2e..c6500d6 100644
--- a/pip-requirements.txt
+++ b/pip-requirements.txt
@@ -45,7 +45,7 @@ pbr==3.1.1
 pexpect==4.2.1
 pickleshare==0.7.4
 prompt-toolkit==1.0.15
-protobuf==3.4.0
+protobuf==3.18.3
 ptyprocess==0.5.2
 pydot==1.0.2
 Pygments==2.2.0