diff --git a/requirements.txt b/requirements.txt
index 2f6266e..535255f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -68,7 +68,7 @@ patsy==0.5.1
 pdfminer==20191125
 plac==1.1.3
 preshed==3.0.2
-protobuf==3.11.3
+protobuf==3.18.3
 psutil==5.7.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8