diff --git a/requirements.txt b/requirements.txt
index 758fe5f..c148d3e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ pandocfilters==1.4.2
 
 pickleshare==0.7.4
 
-protobuf==3.5.1
+protobuf==3.15.0
 psycopg2==2.7.7
 python-dateutil==2.8.0