diff --git a/requirements.txt b/requirements.txt
index a7785af..4ea0577 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,7 +41,7 @@ pickleshare==0.7.5
 Pillow==6.2.0
 promise==2.2.1
 prompt-toolkit==2.0.9
-protobuf==3.9.1
+protobuf==3.15.0
 psutil==5.6.6
 ptyprocess==0.6.0
 pycparser==2.19