diff --git a/packages/binary/drng/subtypes/collectiveBeacon/collective_beacon.go b/packages/binary/drng/subtypes/collectiveBeacon/collective_beacon.go
index f5f3a560c0cae831d7e8f521000140a9e971c92d..3e5d8fa0a3867116cd634a96ea4bfd41a5f2d0cc 100644
--- a/packages/binary/drng/subtypes/collectiveBeacon/collective_beacon.go
+++ b/packages/binary/drng/subtypes/collectiveBeacon/collective_beacon.go
@@ -52,6 +52,14 @@ func VerifyCollectiveBeacon(state *state.State, data *events.CollectiveBeaconEve
 		return errors.New("Distributed Public Key does not match")
 	}
 
+	if data.Round <= state.Randomness().Round {
+		return errors.New("invalid Round")
+	}
+
+	if data.InstanceID != state.Committee().InstanceID {
+		return errors.New("invalid instanceID")
+	}
+
 	if err := verifySignature(data); err != nil {
 		return err
 	}