diff --git a/rust/pkg/cardano_serialization_lib.js.flow b/rust/pkg/cardano_serialization_lib.js.flow
index 83827fb1..3d0c61dd 100644
--- a/rust/pkg/cardano_serialization_lib.js.flow
+++ b/rust/pkg/cardano_serialization_lib.js.flow
@@ -5,6 +5,89 @@
  * @flow
  */
 
+/**
+ * @param {string} json
+ * @param {number} schema
+ * @returns {PlutusData}
+ */
+declare export function encode_json_str_to_plutus_datum(
+  json: string,
+  schema: number
+): PlutusData;
+
+/**
+ * @param {PlutusData} datum
+ * @param {number} schema
+ * @returns {string}
+ */
+declare export function decode_plutus_datum_to_json_str(
+  datum: PlutusData,
+  schema: number
+): string;
+
+/**
+ * @param {Uint8Array} bytes
+ * @returns {TransactionMetadatum}
+ */
+declare export function encode_arbitrary_bytes_as_metadatum(
+  bytes: Uint8Array
+): TransactionMetadatum;
+
+/**
+ * @param {TransactionMetadatum} metadata
+ * @returns {Uint8Array}
+ */
+declare export function decode_arbitrary_bytes_from_metadatum(
+  metadata: TransactionMetadatum
+): Uint8Array;
+
+/**
+ * @param {string} json
+ * @param {number} schema
+ * @returns {TransactionMetadatum}
+ */
+declare export function encode_json_str_to_metadatum(
+  json: string,
+  schema: number
+): TransactionMetadatum;
+
+/**
+ * @param {TransactionMetadatum} metadatum
+ * @param {number} schema
+ * @returns {string}
+ */
+declare export function decode_metadatum_to_json_str(
+  metadatum: TransactionMetadatum,
+  schema: number
+): string;
+
+/**
+ * @param {Transaction} tx
+ * @param {LinearFee} linear_fee
+ * @returns {BigNum}
+ */
+declare export function min_fee(tx: Transaction, linear_fee: LinearFee): BigNum;
+
+/**
+ * @param {ExUnits} ex_units
+ * @param {ExUnitPrices} ex_unit_prices
+ * @returns {BigNum}
+ */
+declare export function calculate_ex_units_ceil_cost(
+  ex_units: ExUnits,
+  ex_unit_prices: ExUnitPrices
+): BigNum;
+
+/**
+ * @param {Transaction} tx
+ * @param {ExUnitPrices} ex_unit_prices
+ * @returns {BigNum}
+ */
+declare export function min_script_fee(
+  tx: Transaction,
+  ex_unit_prices: ExUnitPrices
+): BigNum;
+
 /**
  * @param {string} password
  * @param {string} salt
@@ -179,89 +262,6 @@ declare export function encode_json_str_to_native_script(
   schema: number
 ): NativeScript;
 
-/**
- * @param {string} json
- * @param {number} schema
- * @returns {PlutusData}
- */
-declare export function encode_json_str_to_plutus_datum(
-  json: string,
-  schema: number
-): PlutusData;
-
-/**
- * @param {PlutusData} datum
- * @param {number} schema
- * @returns {string}
- */
-declare export function decode_plutus_datum_to_json_str(
-  datum: PlutusData,
-  schema: number
-): string;
-
-/**
- * @param {Uint8Array} bytes
- * @returns {TransactionMetadatum}
- */
-declare export function encode_arbitrary_bytes_as_metadatum(
-  bytes: Uint8Array
-): TransactionMetadatum;
-
-/**
- * @param {TransactionMetadatum} metadata
- * @returns {Uint8Array}
- */
-declare export function decode_arbitrary_bytes_from_metadatum(
-  metadata: TransactionMetadatum
-): Uint8Array;
-
-/**
- * @param {string} json
- * @param {number} schema
- * @returns {TransactionMetadatum}
- */
-declare export function encode_json_str_to_metadatum(
-  json: string,
-  schema: number
-): TransactionMetadatum;
-
-/**
- * @param {TransactionMetadatum} metadatum
- * @param {number} schema
- * @returns {string}
- */
-declare export function decode_metadatum_to_json_str(
-  metadatum: TransactionMetadatum,
-  schema: number
-): string;
-
-/**
- * @param {Transaction} tx
- * @param {LinearFee} linear_fee
- * @returns {BigNum}
- */
-declare export function min_fee(tx: Transaction, linear_fee: LinearFee): BigNum;
-
-/**
- * @param {ExUnits} ex_units
- * @param {ExUnitPrices} ex_unit_prices
- * @returns {BigNum}
- */
-declare export function calculate_ex_units_ceil_cost(
-  ex_units: ExUnits,
-  ex_unit_prices: ExUnitPrices
-): BigNum;
-
-/**
- * @param {Transaction} tx
- * @param {ExUnitPrices} ex_unit_prices
- * @returns {BigNum}
- */
-declare export function min_script_fee(
-  tx: Transaction,
-  ex_unit_prices: ExUnitPrices
-): BigNum;
-
 /**
  */
 
@@ -333,15 +333,6 @@ declare export var NetworkIdKind: {|
   +Mainnet: 1, // 1
 |};
 
-/**
- * Used to choosed the schema for a script JSON string
- */
-
-declare export var ScriptSchema: {|
-  +Wallet: 0, // 0
-  +Node: 1, // 1
-|};
-
 /**
  */
 
@@ -408,14 +399,6 @@ declare export var MetadataJsonSchema: {|
   +DetailedSchema: 2, // 2
 |};
 
-/**
- */
-
-declare export var CborContainerType: {|
-  +Array: 0, // 0
-  +Map: 1, // 1
-|};
-
 /**
  */
 
@@ -434,6 +417,23 @@ declare export var StakeCredKind: {|
   +Script: 1, // 1
 |};
 
+/**
+ * Used to choosed the schema for a script JSON string
+ */
+
+declare export var ScriptSchema: {|
+  +Wallet: 0, // 0
+  +Node: 1, // 1
+|};
+
+/**
+ */
+
+declare export var CborContainerType: {|
+  +Array: 0, // 0
+  +Map: 1, // 1
+|};
+
 /**
  */
 declare export class Address {
@@ -10977,7 +10977,7 @@ export interface TransactionBodyJSON {
   update?: UpdateJSON | null;
   validity_start_interval?: string | null;
   withdrawals?: {
-    [k: string]: ProtocolParamUpdateJSON,
+    [k: string]: string,
   } | null;
 }
 export type TransactionHashJSON = string;
@@ -11036,5 +11036,5 @@ export interface VkeywitnessJSON {
 }
 export type VkeywitnessesJSON = VkeywitnessJSON[];
 export interface WithdrawalsJSON {
-  [k: string]: ProtocolParamUpdateJSON;
+  [k: string]: string;
 }
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index 4881f760..747a842f 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -1797,10 +1797,10 @@ impl JsonSchema for Withdrawals {
         String::from("Withdrawals")
     }
     fn json_schema(gen: &mut schemars::gen::SchemaGenerator) -> schemars::schema::Schema {
-        std::collections::BTreeMap::<GenesisHash, ProtocolParamUpdate>::json_schema(gen)
+        std::collections::BTreeMap::<RewardAddress, Coin>::json_schema(gen)
     }
     fn is_referenceable() -> bool {
-        std::collections::BTreeMap::<GenesisHash, ProtocolParamUpdate>::is_referenceable()
+        std::collections::BTreeMap::<RewardAddress, Coin>::is_referenceable()
     }
 }
 
diff --git a/rust/src/serialization.rs b/rust/src/serialization.rs
index 6431741f..cade295b 100644
--- a/rust/src/serialization.rs
+++ b/rust/src/serialization.rs
@@ -4654,12 +4654,21 @@ impl DeserializeEmbeddedGroup for HeaderBody {
         let block_body_hash =
             (|| -> Result<_, DeserializeError> { Ok(BlockHash::deserialize(raw)?) })()
                 .map_err(|e| e.annotate("block_body_hash"))?;
+
         let operational_cert = (|| -> Result<_, DeserializeError> {
-            Ok(OperationalCert::deserialize_as_embedded_group(raw, len)?)
+            if raw.cbor_type()? == CBORType::Array {
+                Ok(OperationalCert::deserialize(raw)?)
+            } else {
+                Ok(OperationalCert::deserialize_as_embedded_group(raw, len)?)
+            }
         })()
         .map_err(|e| e.annotate("operational_cert"))?;
         let protocol_version = (|| -> Result<_, DeserializeError> {
-            Ok(ProtocolVersion::deserialize_as_embedded_group(raw, len)?)
+            if raw.cbor_type()? == CBORType::Array {
+                Ok(ProtocolVersion::deserialize(raw)?)
+            } else {
+                Ok(ProtocolVersion::deserialize_as_embedded_group(raw, len)?)
+            }
         })()
         .map_err(|e| e.annotate("protocol_version"))?;
         Ok(HeaderBody {
diff --git a/rust/src/utils.rs b/rust/src/utils.rs
index 42fe66be..3dc85bf0 100644
--- a/rust/src/utils.rs
+++ b/rust/src/utils.rs
@@ -855,11 +855,11 @@ pub(crate) fn read_bounded_bytes<R: BufRead + Seek>(
                             .into());
                     }
                     cbor_event::Len::Len(len) => {
-                        if chunk_len_sz > BOUNDED_BYTES_CHUNK_SIZE {
+                        if len as usize > BOUNDED_BYTES_CHUNK_SIZE {
                             return Err(DeserializeFailure::OutOfRange {
                                 min: 0,
                                 max: BOUNDED_BYTES_CHUNK_SIZE,
-                                found: chunk_len_sz,
+                                found: len as usize,
                             }
                                 .into());
                         }