diff --git a/requirements.txt b/requirements.txt
index 86ced28..5c7a1ab 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ more-itertools==8.9.0
 numpy==1.21.2
 packaging==21.0
 pluggy==1.0.0
-protobuf==3.17.3
+protobuf==3.18.1
 py==1.10.0
 pycodestyle==2.7.0
 pyflakes==2.3.1