diff --git a/phenopipe-web/requirements.txt b/phenopipe-web/requirements.txt
index 9a5ed07..c3f7066 100644
--- a/phenopipe-web/requirements.txt
+++ b/phenopipe-web/requirements.txt
@@ -40,7 +40,7 @@ Mako==1.0.6
 MarkupSafe==0.23
 openpyxl==2.4.8
 promise==1.0.1
-protobuf==3.4.0
+protobuf==3.15.0
 psycopg2==2.6.2
 pycparser==2.17
 Pygments==2.2.0