diff --git a/requirements.txt b/requirements.txt
index 50878cd..ec88b06 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ murmurhash==1.0.2
 numpy==1.18.5
 plac==1.1.3
 preshed==3.0.2
-protobuf==3.12.2
+protobuf==3.18.3
 python-dateutil==2.8.1
 pytz==2020.1
 regex==2020.6.8