diff --git a/requirements.txt b/requirements.txt
index 7acebd1..18e5546 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ mmh3==2.5.1
 msgpack-python==0.5.4
 numpy==1.17.0
 Pillow==6.1.0
-protobuf==3.9.1
+protobuf==3.15.0
 psycopg2==2.7.4
 pyasn1==0.4.2
 pycparser==2.18