diff --git a/requirements/main.txt b/requirements/main.txt
index 91bf94d..099ea43 100644
--- a/requirements/main.txt
+++ b/requirements/main.txt
@@ -1,5 +1,5 @@
 urllib3==1.24.1
-protobuf==3.6.1
+protobuf==3.18.3
 pilosa-roaring==0.2.0
 opentracing==1.3.0