diff --git a/src/account/default.ts b/src/account/default.ts
index 8d9ecfb3a..9e3551bc2 100644
--- a/src/account/default.ts
+++ b/src/account/default.ts
@@ -302,7 +302,7 @@ export class Account extends Provider implements AccountInterface {
   }
 
   public async declare(
-    { contract, classHash: providedClassHash }: DeclareContractPayload,
+    { contract, classHash: providedClassHash }: DeclareContractPayload, // TODO: compiledClassHash i casm
     transactionsDetail: InvocationsDetails = {}
   ): Promise<DeclareContractResponse> {
     const nonce = toBigInt(transactionsDetail.nonce ?? (await this.getNonce()));
diff --git a/src/provider/sequencer.ts b/src/provider/sequencer.ts
index bbd4f0303..dacd5e9bc 100644
--- a/src/provider/sequencer.ts
+++ b/src/provider/sequencer.ts
@@ -388,14 +388,27 @@ export class SequencerProvider implements ProviderInterface {
     { senderAddress, contractDefinition, signature }: DeclareContractTransaction,
     details: InvocationsDetailsWithNonce
   ): Promise<DeclareContractResponse> {
+    if ('program' in contractDefinition) {
+      return this.fetchEndpoint('add_transaction', undefined, {
+        type: TransactionType.DECLARE,
+        contract_class: contractDefinition,
+        nonce: toHex(details.nonce),
+        signature: signatureToDecimalArray(signature),
+        sender_address: senderAddress,
+        max_fee: toHex(details.maxFee || 0),
+        version: '0x1',
+      }).then(this.responseParser.parseDeclareContractResponse);
+    }
+    // Cairo 1
     return this.fetchEndpoint('add_transaction', undefined, {
       type: TransactionType.DECLARE,
+      sender_address: senderAddress,
+      compiled_class_hash: details.compiledClassHash,
       contract_class: contractDefinition,
       nonce: toHex(details.nonce),
       signature: signatureToDecimalArray(signature),
-      sender_address: senderAddress,
       max_fee: toHex(details.maxFee || 0),
-      version: toHex(details.version || 1),
+      version: '0x2',
     }).then(this.responseParser.parseDeclareContractResponse);
   }
 
diff --git a/src/signer/default.ts b/src/signer/default.ts
index 1c8e56fcd..ef9eabb4c 100644
--- a/src/signer/default.ts
+++ b/src/signer/default.ts
@@ -78,7 +78,15 @@ export class Signer implements SignerInterface {
 
   public async signDeclareTransaction(
     // contractClass: ContractClass,  // Should be used once class hash is present in ContractClass
-    { classHash, senderAddress, chainId, maxFee, version, nonce }: DeclareSignerDetails
+    {
+      classHash,
+      senderAddress,
+      chainId,
+      maxFee,
+      version,
+      nonce,
+      compiledClassHash,
+    }: DeclareSignerDetails
   ) {
     const msgHash = calculateDeclareTransactionHash(
       classHash,
@@ -86,7 +94,8 @@ export class Signer implements SignerInterface {
       version,
       maxFee,
       chainId,
-      nonce
+      nonce,
+      compiledClassHash
     );
 
     return starkCurve.sign(msgHash, this.pk);
diff --git a/src/types/api/sequencer.ts b/src/types/api/sequencer.ts
index 6a71bf7af..2d1d67866 100644
--- a/src/types/api/sequencer.ts
+++ b/src/types/api/sequencer.ts
@@ -86,6 +86,7 @@ export namespace Sequencer {
     nonce: BigNumberish;
     max_fee?: BigNumberish;
     version?: BigNumberish;
+    compiled_class_hash?: string; // v2 declare
   };
 
   export type DeployTransaction = {
diff --git a/src/types/lib.ts b/src/types/lib.ts
index 325a4fcfc..4c26ea4f4 100644
--- a/src/types/lib.ts
+++ b/src/types/lib.ts
@@ -98,7 +98,10 @@ export type InvocationsDetails = {
   version?: BigNumberish;
 };
 
-export type InvocationsDetailsWithNonce = InvocationsDetails & { nonce: BigNumberish };
+export type InvocationsDetailsWithNonce = InvocationsDetails & {
+  nonce: BigNumberish;
+  compiledClassHash?: string;
+};
 
 export enum TransactionStatus {
   NOT_RECEIVED = 'NOT_RECEIVED',
diff --git a/src/types/signer.ts b/src/types/signer.ts
index 00c1b24a7..64dad7fd5 100644
--- a/src/types/signer.ts
+++ b/src/types/signer.ts
@@ -14,6 +14,7 @@ export interface DeclareSignerDetails {
   maxFee: BigNumberish;
   version: BigNumberish;
   nonce: BigNumberish;
+  compiledClassHash?: string;
 }
 
 export type DeployAccountSignerDetails = Required<DeployAccountContractPayload> &
diff --git a/src/utils/hash.ts b/src/utils/hash.ts
index 15a85e3fa..78432decb 100644
--- a/src/utils/hash.ts
+++ b/src/utils/hash.ts
@@ -126,7 +126,8 @@ export function calculateDeclareTransactionHash(
   version: BigNumberish,
   maxFee: BigNumberish,
   chainId: StarknetChainId,
-  nonce: BigNumberish
+  nonce: BigNumberish,
+  compiledClassHash?: string
 ): string {
   return calculateTransactionHashCommon(
     TransactionHashPrefix.DECLARE,
@@ -136,7 +137,7 @@ export function calculateDeclareTransactionHash(
     [classHash],
     maxFee,
     chainId,
-    [nonce]
+    [nonce, ...(compiledClassHash ? [compiledClassHash] : [])]
   );
 }