diff --git a/requirements.txt b/requirements.txt
index cc2dca2..dcb5ded 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -66,7 +66,7 @@ opt-einsum==3.2.0
 pexpect==4.2.1
 Pillow==6.2.0
 pipenv==2018.11.26
-protobuf==3.11.3
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycairo==1.16.2