diff --git a/requirements.txt b/requirements.txt
index be74001..bc8e432 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ matplotlib==3.2.1
 numpy==1.18.2
 oauthlib==3.1.0
 opt-einsum==3.2.0
-protobuf==3.11.3
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pyparsing==2.4.6