diff --git a/fastpair/proto/fastpair_rpcs.proto b/fastpair/proto/fastpair_rpcs.proto
index 3becc4e8..87db3de2 100644
--- a/fastpair/proto/fastpair_rpcs.proto
+++ b/fastpair/proto/fastpair_rpcs.proto
@@ -112,6 +112,9 @@ message Device {
   // change this.
   float trigger_distance = 8;
 
+  // Output only. Fast Pair only - The anti-spoofing key pair for the device.
+  AntiSpoofingKeyPair anti_spoofing_key_pair = 9;
+
   // Fast Pair only - The type of device being registered.
   DeviceType device_type = 13;