diff --git a/requirements.txt b/requirements.txt
index 887fe79..a0242e2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ mock==3.0.5
 numpy==1.16.5
 pep8==1.7.1
 Pillow==6.1.0
-protobuf==3.9.1
+protobuf==3.15.0
 rawpy==0.13.1
 scipy==1.2.2
 six==1.12.0