diff --git a/requirements.txt b/requirements.txt
index 654ffa7..44329b0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -53,7 +53,7 @@ numpy==1.8.2
 oauth2client==1.3
 pdbpp==0.7.2
 ply==3.4
-protobuf==2.6.1
+protobuf==3.18.3
 py2app==0.7.3
 pyOpenSSL==0.13.1
 pyasn1==0.1.7