AWS Lambda
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Updates a Lambda function's code.

The function's code is locked when you publish a version. You can't modify the code of a published version, only the unpublished version.

Request Syntax

PUT /2015-03-31/functions/FunctionName/code HTTP/1.1 Content-type: application/json { "DryRun": boolean, "Publish": boolean, "RevisionId": "string", "S3Bucket": "string", "S3Key": "string", "S3ObjectVersion": "string", "ZipFile": blob }

URI Request Parameters

The request requires the following URI parameters.


The name of the Lambda function.

Name formats

  • Function name - my-function.

  • Function ARN - arn:aws:lambda:us-west-2:123456789012:function:my-function.

  • Partial ARN - 123456789012:function:my-function.

The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

Length Constraints: Minimum length of 1. Maximum length of 140.

Pattern: (arn:(aws[a-zA-Z-]*)?:lambda:)?([a-z]{2}(-gov)?-[a-z]+-\d{1}:)?(\d{12}:)?(function:)?([a-zA-Z0-9-_]+)(:(\$LATEST|[a-zA-Z0-9-_]+))?

Request Body

The request accepts the following data in JSON format.


Set to true to validate the request parameters and access permissions without modifying the function code.

Type: Boolean

Required: No


Set to true to publish a new version of the function after updating the code. This has the same effect as calling PublishVersion separately.

Type: Boolean

Required: No


Only update the function if the revision ID matches the ID that's specified. Use this option to avoid modifying a function that has changed since you last read it.

Type: String

Required: No


An Amazon S3 bucket in the same AWS Region as your function. The bucket can be in a different AWS account.

Type: String

Length Constraints: Minimum length of 3. Maximum length of 63.

Pattern: ^[0-9A-Za-z\.\-_]*(?<!\.)$

Required: No


The Amazon S3 key of the deployment package.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Required: No


For versioned objects, the version of the deployment package object to use.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Required: No


The base64-encoded contents of the deployment package. AWS SDK and AWS CLI clients handle the encoding for you.

Type: Base64-encoded binary data object

Required: No

Response Syntax

HTTP/1.1 200 Content-type: application/json { "CodeSha256": "string", "CodeSize": number, "DeadLetterConfig": { "TargetArn": "string" }, "Description": "string", "Environment": { "Error": { "ErrorCode": "string", "Message": "string" }, "Variables": { "string" : "string" } }, "FunctionArn": "string", "FunctionName": "string", "Handler": "string", "KMSKeyArn": "string", "LastModified": "string", "Layers": [ { "Arn": "string", "CodeSize": number } ], "MasterArn": "string", "MemorySize": number, "RevisionId": "string", "Role": "string", "Runtime": "string", "Timeout": number, "TracingConfig": { "Mode": "string" }, "Version": "string", "VpcConfig": { "SecurityGroupIds": [ "string" ], "SubnetIds": [ "string" ], "VpcId": "string" } }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


The SHA256 hash of the function's deployment package.

Type: String


The size of the function's deployment package, in bytes.

Type: Long


The function's dead letter queue.

Type: DeadLetterConfig object


The function's description.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 256.


The function's environment variables.

Type: EnvironmentResponse object


The function's Amazon Resource Name (ARN).

Type: String

Pattern: arn:(aws[a-zA-Z-]*)?:lambda:[a-z]{2}(-gov)?-[a-z]+-\d{1}:\d{12}:function:[a-zA-Z0-9-_\.]+(:(\$LATEST|[a-zA-Z0-9-_]+))?


The name of the function.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 170.

Pattern: (arn:(aws[a-zA-Z-]*)?:lambda:)?([a-z]{2}(-gov)?-[a-z]+-\d{1}:)?(\d{12}:)?(function:)?([a-zA-Z0-9-_\.]+)(:(\$LATEST|[a-zA-Z0-9-_]+))?


The function that Lambda calls to begin executing your function.

Type: String

Length Constraints: Maximum length of 128.

Pattern: [^\s]+


The KMS key that's used to encrypt the function's environment variables. This key is only returned if you've configured a customer-managed CMK.

Type: String

Pattern: (arn:(aws[a-zA-Z-]*)?:[a-z0-9-.]+:.*)|()


The date and time that the function was last updated, in ISO-8601 format (YYYY-MM-DDThh:mm:ss.sTZD).

Type: String


The function's layers.

Type: Array of Layer objects


For Lambda@Edge functions, the ARN of the master function.

Type: String

Pattern: arn:(aws[a-zA-Z-]*)?:lambda:[a-z]{2}(-gov)?-[a-z]+-\d{1}:\d{12}:function:[a-zA-Z0-9-_]+(:(\$LATEST|[a-zA-Z0-9-_]+))?


The memory that's allocated to the function.

Type: Integer

Valid Range: Minimum value of 128. Maximum value of 3008.


The latest updated revision of the function or alias.

Type: String


The function's execution role.

Type: String

Pattern: arn:(aws[a-zA-Z-]*)?:iam::\d{12}:role/?[a-zA-Z_0-9+=,.@\-_/]+


The runtime environment for the Lambda function.

Type: String

Valid Values: nodejs8.10 | nodejs10.x | java8 | python2.7 | python3.6 | python3.7 | dotnetcore1.0 | dotnetcore2.1 | go1.x | ruby2.5 | provided


The amount of time that Lambda allows a function to run before stopping it.

Type: Integer

Valid Range: Minimum value of 1.


The function's AWS X-Ray tracing configuration.

Type: TracingConfigResponse object


The version of the Lambda function.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Pattern: (\$LATEST|[0-9]+)


The function's networking configuration.

Type: VpcConfigResponse object



You have exceeded your maximum total code size per account. Learn more

HTTP Status Code: 400


One of the parameters in the request is invalid. For example, if you provided an IAM role for AWS Lambda to assume in the CreateFunction or the UpdateFunctionConfiguration API, that AWS Lambda is unable to assume you will get this exception.

HTTP Status Code: 400


The RevisionId provided does not match the latest RevisionId for the Lambda function or alias. Call the GetFunction or the GetAlias API to retrieve the latest RevisionId for your resource.

HTTP Status Code: 412


The resource (for example, a Lambda function or access policy statement) specified in the request does not exist.

HTTP Status Code: 404


The AWS Lambda service encountered an internal error.

HTTP Status Code: 500


Request throughput limit exceeded.

HTTP Status Code: 429

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: