diff --git a/requirements.txt b/requirements.txt
index 403b47c..f66129e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ patsy==0.5.1
 pipenv==2018.11.26
 plac==0.9.6
 preshed==2.0.1
-protobuf==3.8.0
+protobuf==3.15.0
 psycopg2==2.8.3
 py-openaq==1.1.0
 pyasn1==0.4.5