diff --git a/requirements.txt b/requirements.txt
index 77df8f9..16ecdd9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -44,7 +44,7 @@ pbr==3.1.1
 pexpect==4.3.0
 pickleshare==0.7.4
 prompt-toolkit==1.0.15
-protobuf==3.5.0.post1
+protobuf==3.15.0
 ptyprocess==0.5.2
 Pygments==2.2.0
 python-dateutil==2.6.1