diff --git a/requirements_py2_mmvenv.txt b/requirements_py2_mmvenv.txt
index e27f567..84277b0 100644
--- a/requirements_py2_mmvenv.txt
+++ b/requirements_py2_mmvenv.txt
@@ -12,7 +12,7 @@ Markdown==3.1.1
 mock==3.0.5
 numpy==1.13.1
 pandas==0.23.4
-protobuf==3.12.0
+protobuf==3.18.3
 python-dateutil==2.8.1
 pytz==2020.1
 PyYAML==5.3.1