diff --git a/requirements.txt b/requirements.txt
index 41edcbd..3c3a094 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ idna==2.8
 jws==0.1.3
 msgpack==0.6.1
 oauth2client==3.0.0
-protobuf==3.8.0
+protobuf==3.18.3
 pyasn1==0.4.5
 pyasn1-modules==0.2.5
 pycryptodome==3.4.3