diff --git a/requirements.txt b/requirements.txt
index 6f7d7ad..558d831 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ pexpect==4.2.1
 pickleshare==0.7.4
 Pillow==4.2.1
 prompt-toolkit==1.0.15
-protobuf==3.4.0
+protobuf==3.15.0
 ptyprocess==0.5.2
 Pygments==2.2.0
 pyparsing==2.2.0
diff --git a/requirements_gpu.txt b/requirements_gpu.txt
index 4329941..7d56b05 100644
--- a/requirements_gpu.txt
+++ b/requirements_gpu.txt
@@ -30,7 +30,7 @@ pexpect==4.2.1
 pickleshare==0.7.4
 Pillow==4.2.1
 prompt-toolkit==1.0.15
-protobuf==3.4.0
+protobuf==3.15.0
 ptyprocess==0.5.2
 Pygments==2.2.0
 pyparsing==2.2.0