diff --git a/ledger/allegra/pparams.go b/ledger/allegra/pparams.go
index 4c255df7..f25c54f3 100644
--- a/ledger/allegra/pparams.go
+++ b/ledger/allegra/pparams.go
@@ -29,3 +29,7 @@ func (p *AllegraProtocolParameters) Update(paramUpdate *AllegraProtocolParameter
 type AllegraProtocolParameterUpdate struct {
 	shelley.ShelleyProtocolParameterUpdate
 }
+
+func (u *AllegraProtocolParameterUpdate) UnmarshalCBOR(data []byte) error {
+	return u.UnmarshalCbor(data, u)
+}
diff --git a/ledger/alonzo/alonzo.go b/ledger/alonzo/alonzo.go
index cef02a49..71ae5ffb 100644
--- a/ledger/alonzo/alonzo.go
+++ b/ledger/alonzo/alonzo.go
@@ -513,6 +513,10 @@ type AlonzoProtocolParameterUpdate struct {
 	MaxCollateralInputs  uint            `cbor:"24,keyasint"`
 }
 
+func (u *AlonzoProtocolParameterUpdate) UnmarshalCBOR(data []byte) error {
+	return u.UnmarshalCbor(data, u)
+}
+
 func NewAlonzoBlockFromCbor(data []byte) (*AlonzoBlock, error) {
 	var alonzoBlock AlonzoBlock
 	if _, err := cbor.Decode(data, &alonzoBlock); err != nil {
diff --git a/ledger/conway/conway.go b/ledger/conway/conway.go
index 50864ad5..f50e7466 100644
--- a/ledger/conway/conway.go
+++ b/ledger/conway/conway.go
@@ -279,6 +279,10 @@ type ConwayProtocolParameterUpdate struct {
 	MinFeeRefScriptCostPerByte *cbor.Rat            `cbor:"33,keyasint"`
 }
 
+func (u *ConwayProtocolParameterUpdate) UnmarshalCBOR(data []byte) error {
+	return u.UnmarshalCbor(data, u)
+}
+
 type PoolVotingThresholds struct {
 	cbor.StructAsArray
 	MotionNoConfidence                       cbor.Rat
diff --git a/ledger/mary/pparams.go b/ledger/mary/pparams.go
index 595019f9..12b14e2d 100644
--- a/ledger/mary/pparams.go
+++ b/ledger/mary/pparams.go
@@ -29,3 +29,7 @@ func (p *MaryProtocolParameters) Update(paramUpdate *MaryProtocolParameterUpdate
 type MaryProtocolParameterUpdate struct {
 	allegra.AllegraProtocolParameterUpdate
 }
+
+func (u *MaryProtocolParameterUpdate) UnmarshalCBOR(data []byte) error {
+	return u.UnmarshalCbor(data, u)
+}