diff --git a/requirements.txt b/requirements.txt
index 349aac0..d16cf30 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -62,7 +62,7 @@ pdfminer==20191125
 Pillow==8.1.1
 plac==1.1.3
 preshed==3.0.2
-protobuf==3.12.0
+protobuf==3.18.3
 pyarrow==0.16.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8