diff --git a/cyclonedx/model/crypto.py b/cyclonedx/model/crypto.py
index f0d069f1..7af6a1c6 100644
--- a/cyclonedx/model/crypto.py
+++ b/cyclonedx/model/crypto.py
@@ -1185,6 +1185,7 @@ class _ProtocolPropertiesTypeSerializationHelper(serializable.helpers.BaseHelper
         ProtocolPropertiesType.DTLS,
         ProtocolPropertiesType.EAP_AKA,
         ProtocolPropertiesType.EAP_AKA_PRIME,
+        ProtocolPropertiesType.FIVEG_AKA,
         ProtocolPropertiesType.PRINS,
         ProtocolPropertiesType.QUIC,
     }