diff --git a/requirements.txt b/requirements.txt
index 97fbdc1..613f3c2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ Jinja2==2.10.1
 jws==0.1.3
 MarkupSafe==1.1.1
 oauth2client==4.1.2
-protobuf==3.7.1
+protobuf==3.18.3
 pyasn1==0.4.5
 pyasn1-modules==0.2.4
 pycryptodome==3.8.1