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Update a smart contract
A transaction that allows you to modify the smart contract entity state like admin keys, proxy account, auto renew period and memo. This transaction does not update the contract that is tied to the smart contract entity. The contract tied to the entity is immutable. The contract entity is immutable if an admin key is not specified. Once the transaction has been successfully executed on a Hedera network the previous field values will be updated with the new ones. To get a previous state of a smart contract instance, you can query a mirror node for that data. Any null field is ignored (left unchanged)
Transaction Signing Requirements
  • If only the expiration time is being modified, then no signature is needed on this transaction other than for the account paying for the transaction itself.
  • If any other smart contract entity property is being modified, the transaction must be signed by the admin key.
  • If the admin key is being updated, the new key must sign
Transaction Fees
  • Please see the transaction and query fees table for base transaction fee
  • Please use the Hedera fee estimator to estimate your transaction fee cost
Smart Contract Properties
Field
Description
Admin Key
Sets the new admin key and its fields can be modified arbitrarily if this key signs a transaction to modify it. If this is null, then such modifications are not possible, and there is no administrator that can override the normal operation of this smart contract instance. Note that if it is created with no admin keys, then there is no administrator to authorize changing the admin keys, so there can never be any admin keys for that instance. The bytecode will also be immutable.
Expiration Time
The new expiry of the contract, no earlier than the current expiry (resolves to EXPIRATION_REDUCTION_NOT_ALLOWED otherwise).
Staked ID
The new node account ID or node ID this contract is being staked to. If set to the sentinel 1, this removes the contract's staked node ID. See HIP-406. Note: Accounts cannot stake to contract accounts. This will fixed in a future release.
Decline Rewards
Updates the contract to decline receiving staking rewards if set to true. The default value is false. See HIP-406.​
Auto Renew Period
The new period that the instance will charge its account every this many seconds to renew. (not enabled)
Auto Renew Account ID
If set to the sentinel 0.0.0 AccountID, this field removes the contract's auto-renew account. Otherwise it updates the contract's auto-renew account to the referenced account. (not enabled)
Automatic Token Associations
The maximum number of tokens that this contract can be automatically associated with (i.e., receive air-drops from).
Memo
The new memo to be associated with this contract.
Constructor
Description
new ContractUpdateTransaction()
Initializes the ContractUpdateTransaction object
new ContractUpdateTransaction()

Methods

V2
V1
Method
Type
Requirement
setContractId(<contractId>)
​ContractId​
Required
setAdminKey(<keys>)
Key
Optional
setContractMemo(<memo>)
String
Optional
setContractExpirationTime(<expirationTime)
Instant
Optional
setMaxAutomaticTokenAssociations()
int
Optional
setContractMemo(<memo>)
String
Optional
setStakedAccountId(<stakedAccountId>)
AccountId
Optional
setStakedNodeId(<stakedNodeId>)
long
Optional
setDeclineStakingReward(<declineStakingReward>)
boolean
Optional
setAutoRenewPeriod(<autoRenewPeriod>)
Duration
Optional
setAutoRenewAccountId(<accountId>)
AccountId
Optional
Java
//Create the transaction
ContractUpdateTransaction transaction = new ContractUpdateTransaction()
.setContractId(contractId)
.setAdminKey(adminKey);
​
//Modify the default transaction fee
ContractUpdateTransaction modifyTransactionFee = transaction.setMaxTransactionFee(new Hbar(20));
​
//sign with the new admin key, sign with the old admin key, sign with the client operator account and submit to a Hedera network
TransactionResponse txResponse = modifyTransactionFee.freezeWith(client).sign(newAdminKey).sign(adminKey).execute(client);
​
//Get the consensus status of the transaction
Status transactionStatus = receipt.status;
​
System.out.println("The consensus status of the transaction is " +transactionStatus);
​
//v2.0.0
JavaScript
//Create the transaction
const transaction = await new ContractUpdateTransaction()
.setContractId(contractId)
.setAdminKey(adminKey)
.setMaxTransactionFee(new Hbar(20))
.freezeWith(client);
​
//Sign the transaction with the old admin key and new admin key
const signTx = await (await transaction.sign(newAdminKey)).sign(adminKey);
​
//Sign the transaction with the client operator private key and submit to a Hedera network
const txResponse = await signTx.execute(client);
​
//Request the receipt of the transaction
const receipt = await txResponse.getReceipt(client)
​
//Get the consensus status of the transaction
const transactionStatus = receipt.status;
​
console.log("The consensus status of the transaction is " +transactionStatus);
​
//v2.0.5
Go
//Create the transaction
transaction := hedera.NewContractUpdateTransaction().
SetContractID(contractId).
SetBytecodeFileID(byteCodeFileID).
SetAdminKey(adminKey)
​
//Change the default max transaction fee to 2 hbars
modifyMaxTransactionFee := transaction.SetMaxTransactionFee(hedera.HbarFrom(2, hedera.HbarUnits.Hbar))
​
//Freeze the transaction
freezeTransaction, err := modifyMaxTransactionFee.FreezeWith(client)
if err != nil {
panic(err)
}
​
//Sign with the old admin key, sign with the new admin key, sign with the client operator account and submit to a Hedera network
txResponse, err := freezeTransaction.Sign(newAdminKey).Sign(adminKey).Execute(client)
if err != nil {
panic(err)
}
​
//Request the receipt of the transaction
receipt, err = txResponse.GetReceipt(client)
if err != nil {
panic(err)
}
​
//Get the transaction consensus status
transactionStatus := receipt.Status
​
fmt.Printf("The transaction consensus status %v\n", transactionStatus)
​
//v2.0.0
Method
Type
Requirement
setContractId(<contractId>)
ContractId
Required
setAdminKey(<publicKey>)
Ed25519PubicKey
Optional
setBytecodeFileId(<fileId>)
FileId
Deprecated [0.20.0]
setProxyAccountId(<accountId>)
AccountId
Optional
setContractMemo(<memo>)
String
Optional
setContractExpirationTime(<expirationTime)
Instant
Optional
setAutoRenewPeriod(<autoRenewPeriod>)
Duration
Optional
Java
ContractUpdateTransaction transaction = new ContractUpdateTransaction()
.setContractId(newContractId)
.setContractMemo("Update the memo of the smart contract");
​
TransactionId txId = transaction.execute(client);
​
TransactionReceipt receipt = txId.getReceipt(client);
​
Status transactionStatus = receipt.status;
​
System.out.println("The transaction consensus status is " +transactionStatus)
​
//v1.3.2
JavaScript
const transaction = new ContractUpdateTransaction()
.setContractId(newContractId)
.setContractMemo("Update the memo of the smart contract");
​
const txId = await transaction.execute(client);
​
const receipt = await txId.getReceipt(client);
​
const transactionStatus = receipt.status;
​
System.out.println("The transaction consensus status is " +transactionStatus)
​
//v1.4.4

Get transaction values

V2
Method
Type
Requirement
getContractId()
​ContractId​
Required
getAdminKey()
Key
Optional
getBytecodeFileId()
​FileId​
Optional
getProxyAccountId()
​AccountId​
Optional
getContractMemo()
String
Optional
getStakedAccountId()
AccountId
Optional
getStakedNodeId()
long
Optional
getDeclineStakingReward()
boolean
Optional
getAutoRenewPeriod()
Duration
Optional
Java
//Create the transaction with an admin key
ContractUpdateTransaction transaction = new ContractUpdateTransaction()
.setContractId(contractId)
.setAdminKey(adminKey);
​
//Get admin key
transaction.getAdminKey()
​
//v2.0.0
JavaScript
//Create the transaction with an admin key
const transaction = new ContractUpdateTransaction()
.setContractId(contractId)
.setAdminKey(adminKey);
​
//Get admin key
transaction.getAdminKey()
​
//v2.0.0
Go
//Create the transaction
transaction := hedera.NewContractUpdateTransaction().
SetContractID(contractId).
SetBytecodeFileID(byteCodeFileID).
SetAdminKey(adminKey)
​
//Get admin key
transaction.GetAdminKey()
​
//v2.0.0
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Methods
Get transaction values