diff --git a/requirements.txt b/requirements.txt
index a699e89..8a93816 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -46,7 +46,7 @@ parsimonious==0.8.1
 plac==0.9.6
 pluggy==0.12.0
 preshed==2.0.1
-protobuf==3.9.1
+protobuf==3.18.3
 py==1.8.0
 Pygments==2.4.2
 pyparsing==2.4.2