--- a/Ieee1609Dot2.asn
+++ b/Ieee1609Dot2.asn
@@ -10,7 +10,7 @@
 
 Ieee1609Dot2 {iso(1) identified-organization(3) ieee(111)
   standards-association-numbered-series-standards(2) wave-stds(1609)
-  dot2(2) base(1) schema(1) major-version-2(2) minor-version-7(7)}
+  dot2(2) base(1) schema(1) major-version-2(2) minor-version-8(8)}
 
 DEFINITIONS AUTOMATIC TAGS ::= BEGIN
 
@@ -24,6 +24,7 @@
   EXT-TYPE,
   Extension,
   ExtId,
+  FnDsa512Key,
   GeographicRegion,
   GroupLinkageValue,
   HashAlgorithm,
@@ -1048,6 +1049,13 @@
  * @param certRequestExtensions: indicates additional permissions to request
  * certificates containing endEntityExtensions.
  *
+ * @param altVerificationKey: carries the alternative FN-DSA-512 public key
+ * in a hybrid authority certificate. It is absent from end-entity
+ * authorization tickets.
+ *
+ * @param altSignatureValue: carries the FN-DSA-512 signature generated by
+ * the issuer over this certificate.
+ *
  * @note In IEEE Std 1609.2-2022 these were not marked optional; they are in
  * this version of the standard; this is technically not backwards compatible
  * but in practice there are no scenarios in which a legacy system will break
@@ -1160,7 +1168,9 @@
   flags                  BIT STRING {usesCubk (0)} (SIZE (8)) OPTIONAL,
   appExtensions          SequenceOfAppExtensions OPTIONAL,
   certIssueExtensions    SequenceOfCertIssueExtensions OPTIONAL,
-  certRequestExtension   SequenceOfCertRequestExtensions OPTIONAL
+  certRequestExtension   SequenceOfCertRequestExtensions OPTIONAL,
+  altVerificationKey     PublicVerificationKey OPTIONAL,
+  altSignatureValue      Signature OPTIONAL
 }
 (WITH COMPONENTS { ..., appPermissions PRESENT} |
  WITH COMPONENTS { ..., certIssuePermissions PRESENT} |
--- a/Ieee1609Dot2BaseTypes.asn
+++ b/Ieee1609Dot2BaseTypes.asn
@@ -10,7 +10,7 @@
 
 Ieee1609Dot2BaseTypes {iso(1) identified-organization(3) ieee(111)
   standards-association-numbered-series-standards(2) wave-stds(1609) dot2(2)
-  base(1) base-types(2) major-version-2(2) minor-version-5(5)}
+  base(1) base-types(2) major-version-2(2) minor-version-6(6)}
 
 DEFINITIONS AUTOMATIC TAGS ::= BEGIN
 
@@ -724,7 +724,8 @@
   ...,
   ecdsaBrainpoolP384r1Signature EcdsaP384Signature,
   ecdsaNistP384Signature        EcdsaP384Signature,
-  sm2Signature                  EcsigP256Signature
+  sm2Signature                  EcsigP256Signature,
+  fnDsa512Signature             FnDsa512Signature
 }
 
 /**
@@ -821,6 +822,12 @@
 }
 
 /**
+ * @brief This type contains an FN-DSA-512 signature as a fixed-size octet
+ * string.
+ */
+FnDsa512Signature ::= OCTET STRING (SIZE (666))
+
+/**
  * @brief This structure specifies a point on an elliptic curve in Weierstrass
  * form defined over a 256-bit prime number. The curves supported in this
  * standard are NIST p256 as defined in FIPS 186-5, Brainpool p256r1 as
@@ -888,6 +895,12 @@
 }
 
 /**
+ * @brief This type contains an FN-DSA-512 public verification key as a
+ * fixed-size octet string.
+ */
+FnDsa512Key ::= OCTET STRING (SIZE (897))
+
+/**
  * @brief This enumerated value indicates supported symmetric algorithms. The
  * algorithm identifier identifies both the algorithm itself and a specific
  * mode of operation. The symmetric algorithms supported in this version of
@@ -1045,7 +1058,8 @@
   ... ,
   ecdsaBrainpoolP384r1 EccP384CurvePoint,
   ecdsaNistP384        EccP384CurvePoint,
-  ecsigSm2             EccP256CurvePoint
+  ecsigSm2             EccP256CurvePoint,
+  fnDsa512              FnDsa512Key
 }
 
 /**