diff --git a/requirements.txt b/requirements.txt
index a1896f7..5669c05 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -56,7 +56,7 @@ pdbpp==0.7.2
 PIL==1.1.7
 Pillow==2.6.0
 ply==3.4
-protobuf==2.6.1
+protobuf==3.18.3
 py2app==0.7.3
 pyasn1==0.1.7
 pyasn1-modules==0.0.5