diff --git a/packages/google-cloud-binaryauthorization/protos/grafeas/v1/discovery.proto b/packages/google-cloud-binaryauthorization/protos/grafeas/v1/discovery.proto
index e072ede7976..95b3dc23d5b 100644
--- a/packages/google-cloud-binaryauthorization/protos/grafeas/v1/discovery.proto
+++ b/packages/google-cloud-binaryauthorization/protos/grafeas/v1/discovery.proto
@@ -156,4 +156,7 @@ message DiscoveryOccurrence {
 
   // Files that make up the resource described by the occurrence.
   repeated File files = 11;
+
+  // The last time vulnerability scan results changed.
+  google.protobuf.Timestamp last_vulnerability_update_time = 12;
 }