diff --git a/taskonomy/taskbank/requirement.txt b/taskonomy/taskbank/requirement.txt
index 9009a1b..f9c0381 100644
--- a/taskonomy/taskbank/requirement.txt
+++ b/taskonomy/taskbank/requirement.txt
@@ -29,7 +29,7 @@ olefile==0.45.1
 pathspec==0.5.5
 pbr==3.1.1
 Pillow==4.2.1
-protobuf==3.4.0
+protobuf==3.18.3
 pyparsing==2.2.0
 python-dateutil==2.6.1
 pytz==2018.3