diff --git a/requirements.txt b/requirements.txt
index 5ae4f36..0047ae7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -71,7 +71,7 @@ pexpect==4.4.0
 pickleshare==0.7.4
 Pillow>=6.2.0
 prompt-toolkit==1.0.15
-protobuf==3.5.2.post1
+protobuf==3.15.0
 ptyprocess==0.5.2
 Pygments>=2.7.4
 pyparsing==2.2.0