diff --git a/requirements.txt b/requirements.txt
index c6ac543..93f7c61 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ pexpect==4.3.0
 pickleshare==0.7.4
 Pillow==4.3.0
 prompt-toolkit==1.0.15
-protobuf==3.5.0.post1
+protobuf==3.18.3
 ptyprocess==0.5.2
 pyglet==1.3.0
 Pygments==2.2.0