diff --git a/requirements.txt b/requirements.txt
index dfb5e49..fb8fef7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -55,7 +55,7 @@ parso==0.2.1
 pexpect==4.5.0
 pickleshare==0.7.4
 prompt-toolkit==1.0.15
-protobuf==3.5.2.post1
+protobuf==3.18.3
 ptyprocess==0.5.2
 pycparser==2.18
 Pygments==2.2.0