diff --git a/requirements.txt b/requirements.txt
index 509e0b2..00afbc2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,7 +31,7 @@ pexpect==4.5.0
 pickleshare==0.7.4
 plotly==2.7.0
 prompt-toolkit==1.0.15
-protobuf==3.5.2.post1
+protobuf==3.18.3
 ptyprocess==0.5.2
 Pygments==2.2.0
 pyparsing==2.2.0