diff --git a/requirements.txt b/requirements.txt
index d4413a6..36fa197 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ pandocfilters==1.4.1
 pexpect==4.2.1
 pickleshare==0.7.4
 prompt-toolkit==1.0.14
-protobuf==3.2.0
+protobuf==3.18.3
 ptyprocess==0.5.1
 Pygments>=2.7.4
 pyparsing==2.2.0