diff --git a/barn/requirements.txt b/barn/requirements.txt
index 25462aa..93f5fd3 100644
--- a/barn/requirements.txt
+++ b/barn/requirements.txt
@@ -7,7 +7,7 @@ Markdown==3.1.1
 matplotlib==3.0.3
 mpmath==1.1.0
 numpy==1.13.3
-protobuf==3.9.1
+protobuf==3.18.3
 pyparsing==2.4.2
 python-dateutil==2.8.0
 scipy==1.3.1