diff --git a/requirements.txt b/requirements.txt
index bf137e6..9b395ea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ mccabe==0.6.1
 numpy==1.16.4
 pandas==0.24.2
 promise==2.2.1
-protobuf==3.8.0
+protobuf==3.18.3
 psutil==5.6.6
 pycodestyle==2.5.0
 pyflakes==2.1.1