diff --git a/requirements-gpu-py36.txt b/requirements-gpu-py36.txt
index f71086b..4fc45d7 100644
--- a/requirements-gpu-py36.txt
+++ b/requirements-gpu-py36.txt
@@ -43,7 +43,7 @@ pickleshare==0.7.5
 Pillow==5.3.0
 prometheus-client==0.4.2
 prompt-toolkit==2.0.7
-protobuf==3.6.1
+protobuf==3.15.0
 ptyprocess==0.6.0
 Pygments==2.2.0
 pyparsing==2.2.2
diff --git a/requirements-py36.txt b/requirements-py36.txt
index 0a7b527..dfece36 100644
--- a/requirements-py36.txt
+++ b/requirements-py36.txt
@@ -55,7 +55,7 @@ pickleshare==0.7.5
 Pillow==5.3.0
 prometheus-client==0.4.0
 prompt-toolkit==2.0.5
-protobuf==3.6.1
+protobuf==3.15.0
 ptyprocess==0.6.0
 Pygments==2.2.0
 pyparsing==2.2.2