diff --git a/python2/primary-requirements.txt b/python2/primary-requirements.txt
index d934272..0781597 100644
--- a/python2/primary-requirements.txt
+++ b/python2/primary-requirements.txt
@@ -129,7 +129,7 @@ poyo==0.4.0
 prettyplotlib==0.1.7
 prettytable==0.7.2
 prompt-toolkit==1.0.9
-protobuf==3.1.0.post1
+protobuf==3.18.3
 psutil==5.0.1
 ptyprocess==0.5.1
 py==1.4.32