diff --git a/requirements.txt b/requirements.txt
index e96c3a4..f5910f2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -66,7 +66,7 @@ pandocfilters==1.4.2
 pexpect==4.2.1
 pickleshare==0.7.4
 prompt-toolkit==1.0.15
-protobuf==3.3.0
+protobuf==3.15.0
 psutil==5.2.2
 psycopg2==2.7.3.1
 ptyprocess==0.5.2