diff --git a/requirements.txt b/requirements.txt
index 6dcbf4c..7913fe7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ numpy==1.8.2
 pexpect==3.2
 Pillow==2.6.1
 ply==3.4
-protobuf==3.1.0.post1
+protobuf==3.18.3
 psycopg2==2.6.2
 pyasn1==0.1.7
 pycparser==2.10