diff --git a/python/requirements-py2.txt b/python/requirements-py2.txt
index 2fc56e24..6cd8f247 100644
--- a/python/requirements-py2.txt
+++ b/python/requirements-py2.txt
@@ -8,7 +8,7 @@ grpcio==1.18.0
 more-itertools==5.0.0
 pathlib2==2.3.3
 pluggy==0.8.1
-protobuf==3.6.1
+protobuf==3.15.0
 py==1.10.0
 pytest==4.2.0
 scandir==1.9.0
diff --git a/python/requirements-py3.txt b/python/requirements-py3.txt
index 0b2e71eb..29ab8bd5 100644
--- a/python/requirements-py3.txt
+++ b/python/requirements-py3.txt
@@ -5,7 +5,7 @@ grpcio==1.19.0
 grpcio-tools==1.19.0
 more-itertools==6.0.0
 pluggy==0.8.1
-protobuf==3.6.1
+protobuf==3.15.0
 py==1.10.0
 pytest==4.3.0
 six==1.12.0