diff --git a/requirements.txt b/requirements.txt
index b22eb80..a0a1679 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -52,7 +52,7 @@ patsy==0.2.1
 pexpect==3.1
 Pillow==2.3.0
 piston-mini-client==0.7.5
-protobuf==2.5.0
+protobuf==3.18.3
 psycopg2==2.6.1
 pycrypto==2.6.1
 pycups==1.9.66