diff --git a/requirements.txt b/requirements.txt
index 0df04cd..1f2f49a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ pexpect==4.6.0
 pickleshare==0.7.5
 Pillow==5.2.0
 prompt-toolkit==1.0.15
-protobuf==3.6.0
+protobuf==3.15.0
 ptyprocess==0.6.0
 Pygments==2.3.1
 pyparsing==2.3.0