diff --git a/worker/requirements.txt b/worker/requirements.txt
index f6bbf3e..a11390c 100644
--- a/worker/requirements.txt
+++ b/worker/requirements.txt
@@ -6,7 +6,7 @@ faktory==0.4.0
 idna==2.8
 marshmallow==2.20.1
 mysql-connector-python==8.0.17
-protobuf==3.9.1
+protobuf==3.15.0
 python-dotenv==0.10.3
 requests==2.22.0
 six==1.12.0