diff --git a/requirements.txt b/requirements.txt
index c9969bf..7223caa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ PasteDeploy==2.0.1
 pbkdf2==1.3
 plaster==1.0
 plaster-pastedeploy==0.7
-protobuf==3.7.1
+protobuf==3.15.0
 pycocotools==2.0.0
 pycparser==2.19
 pydicom==1.2.2