Lambda with AutoPublishAlias and AutoPublishAliasAllProperties does not create a new version when the referenced Parameter value changes #3820
Description
Description
In my AWS::Serverless::Function Environment section, I have the Parameter referenced.
When the parameter value changes and I run sam deploy, a new Lambda version is not created.
Steps to reproduce
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Parameters:
TestParameter:
Type: String
Resources:
HelloWorldFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: hello_world/
Handler: app.lambda_handler
Environment:
Variables:
TEST_PARAMETER: !Ref TestParameter
AutoPublishAlias: live
AutoPublishAliasAllProperties: true
Runtime: python3.12
Architectures:
- x86_64
sam build --template-file template.yaml --parameter-overrides TestParameter='3'
sam deploy --config-file samconfig.toml --template-file template.yaml --debug --parameter-overrides TestParameter='3'
Observed result
No new Lambda version is created
2025-09-30 19:30:57,747 | Config file location: .../LambdaVersions/samconfig.toml
2025-09-30 19:30:57,748 | Loading configuration values from [default.['deploy'].parameters] (env.command_name.section) in config file at '.../LambdaVersions/samconfig.toml'...
2025-09-30 19:30:57,748 | Configuration values successfully loaded.
2025-09-30 19:30:57,749 | Configuration values are: {'stack_name': 'LambdaVersions', 'template': 'template.yaml', 'capabilities':
'CAPABILITY_IAM', 'confirm_changeset': True, 'no_resolve_s3': True, 's3_bucket': '...', 's3-prefix': '...'}
2025-09-30 19:30:57,763 | Using config file: samconfig.toml, config environment: default
2025-09-30 19:30:57,764 | Expand command line arguments to:
2025-09-30 19:30:57,764 | --template_file=.../LambdaVersions/template.yaml
--parameter_overrides={'TestParameter': '3'} --fail_on_empty_changeset --confirm_changeset --on_failure=ROLLBACK --max_wait_duration=60
--stack_name=LambdaVersions --s3_bucket=... --capabilities=['CAPABILITY_IAM']
2025-09-30 19:30:57,858 | Collected default values for parameters: {}
2025-09-30 19:30:57,866 | There is no customer defined id or cdk path defined for resource HelloWorldFunction, so we will use the resource
logical id as the resource id
2025-09-30 19:30:57,866 | There is no customer defined id or cdk path defined for resource ServerlessRestApi, so we will use the resource
logical id as the resource id
2025-09-30 19:30:57,866 | 0 stacks found in the template
2025-09-30 19:30:57,867 | Collected default values for parameters: {}
2025-09-30 19:30:57,872 | There is no customer defined id or cdk path defined for resource HelloWorldFunction, so we will use the resource
logical id as the resource id
2025-09-30 19:30:57,873 | There is no customer defined id or cdk path defined for resource ServerlessRestApi, so we will use the resource
logical id as the resource id
2025-09-30 19:30:57,947 | There is no customer defined id or cdk path defined for resource HelloWorldFunction, so we will use the resource
logical id as the resource id
2025-09-30 19:30:57,947 | Sam customer defined id is more priority than other IDs. Customer defined id for resource HelloWorldFunction is
HelloWorldFunction
2025-09-30 19:30:58,439 |
File with same data already exists at ..., skipping upload
Deploying with following values
===============================
Stack name : LambdaVersions
Region :...
Confirm changeset : True
Disable rollback : False
Deployment s3 bucket :...
Capabilities : ["CAPABILITY_IAM"]
Parameter overrides : {"TestParameter": "3"}
Signing Profiles : {}
Initiating deployment
=====================
2025-09-30 19:30:58,466 | Collected default values for parameters: {}
2025-09-30 19:30:58,476 | Sam customer defined id is more priority than other IDs. Customer defined id for resource HelloWorldFunction is
HelloWorldFunction
2025-09-30 19:30:58,477 | There is no customer defined id or cdk path defined for resource ServerlessRestApi, so we will use the resource
logical id as the resource id
2025-09-30 19:30:58,477 | 0 stacks found in the template
2025-09-30 19:30:58,477 | Collected default values for parameters: {}
2025-09-30 19:30:58,486 | Sam customer defined id is more priority than other IDs. Customer defined id for resource HelloWorldFunction is
HelloWorldFunction
2025-09-30 19:30:58,486 | There is no customer defined id or cdk path defined for resource ServerlessRestApi, so we will use the resource
logical id as the resource id
2025-09-30 19:30:58,487 | 2 resources found in the stack
2025-09-30 19:30:59,741 |
File with same data already exists at ....template, skipping upload
Waiting for changeset to be created..
CloudFormation stack changeset
-------------------------------------------------------------------------------------------------------------------------------------
Operation LogicalResourceId ResourceType Replacement
-------------------------------------------------------------------------------------------------------------------------------------
* Modify HelloWorldFunction AWS::Lambda::Function False
-------------------------------------------------------------------------------------------------------------------------------------
Changeset created successfully. arn:aws:cloudformation:...:...:changeSet/samcli-deploy.../...
Previewing CloudFormation changeset before deployment
======================================================
Expected result
According to AutoPublishAliasAllProperties documentation, the new Lambda version should be created ("When true, a new Lambda version is created when any property in the Lambda function is modified").
Compare to changing the Lambda environment variable value in the template directly:
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Parameters:
TestParameter:
Type: String
Resources:
HelloWorldFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: hello_world/
Handler: app.lambda_handler
Environment:
Variables:
TEST_PARAMETER: 3
AutoPublishAlias: live
AutoPublishAliasAllProperties: true
Runtime: python3.12
Architectures:
- x86_64
sam build --template-file template.yaml
sam deploy --config-file samconfig.toml --template-file template.yaml --debug
2025-09-30 19:45:50,908 | Config file location: .../LambdaVersions/samconfig.toml
2025-09-30 19:45:50,910 | Loading configuration values from [default.['deploy'].parameters] (env.command_name.section) in config file at '.../LambdaVersions/samconfig.toml'...
2025-09-30 19:45:50,910 | Configuration values successfully loaded.
2025-09-30 19:45:50,910 | Configuration values are: {'stack_name': 'LambdaVersions', 'template': 'template.yaml', 'capabilities':
'CAPABILITY_IAM', 'confirm_changeset': True, 'no_resolve_s3': True, 's3_bucket': '...', 's3-prefix': '.../'}
2025-09-30 19:45:50,924 | Using config file: samconfig.toml, config environment: default
2025-09-30 19:45:50,924 | Expand command line arguments to:
2025-09-30 19:45:50,925 | --template_file=.../LambdaVersions/template.yaml
--fail_on_empty_changeset --confirm_changeset --on_failure=ROLLBACK --max_wait_duration=60 --stack_name=LambdaVersions
--s3_bucket=... --capabilities=['CAPABILITY_IAM']
2025-09-30 19:45:51,016 | Collected default values for parameters: {}
2025-09-30 19:45:51,024 | There is no customer defined id or cdk path defined for resource HelloWorldFunction, so we will use the resource
logical id as the resource id
2025-09-30 19:45:51,025 | There is no customer defined id or cdk path defined for resource ServerlessRestApi, so we will use the resource
logical id as the resource id
2025-09-30 19:45:51,025 | 0 stacks found in the template
2025-09-30 19:45:51,026 | Collected default values for parameters: {}
2025-09-30 19:45:51,031 | There is no customer defined id or cdk path defined for resource HelloWorldFunction, so we will use the resource
logical id as the resource id
2025-09-30 19:45:51,031 | There is no customer defined id or cdk path defined for resource ServerlessRestApi, so we will use the resource
logical id as the resource id
2025-09-30 19:45:51,104 | There is no customer defined id or cdk path defined for resource HelloWorldFunction, so we will use the resource
logical id as the resource id
2025-09-30 19:45:51,104 | Sam customer defined id is more priority than other IDs. Customer defined id for resource HelloWorldFunction is
HelloWorldFunction
2025-09-30 19:45:51,669 |
File with same data already exists at ..., skipping upload
Deploying with following values
===============================
Stack name : LambdaVersions
Region : ...
Confirm changeset : True
Disable rollback : False
Deployment s3 bucket :...
Capabilities : ["CAPABILITY_IAM"]
Parameter overrides : {}
Signing Profiles : {}
Initiating deployment
=====================
2025-09-30 19:45:51,694 | Collected default values for parameters: {}
2025-09-30 19:45:51,703 | Sam customer defined id is more priority than other IDs. Customer defined id for resource HelloWorldFunction is
HelloWorldFunction
2025-09-30 19:45:51,704 | There is no customer defined id or cdk path defined for resource ServerlessRestApi, so we will use the resource
logical id as the resource id
2025-09-30 19:45:51,704 | 0 stacks found in the template
2025-09-30 19:45:51,705 | Collected default values for parameters: {}
2025-09-30 19:45:51,713 | Sam customer defined id is more priority than other IDs. Customer defined id for resource HelloWorldFunction is
HelloWorldFunction
2025-09-30 19:45:51,713 | There is no customer defined id or cdk path defined for resource ServerlessRestApi, so we will use the resource
logical id as the resource id
2025-09-30 19:45:51,714 | 2 resources found in the stack
Uploading to ...template 1349 / 1349 (100.00%)
Waiting for changeset to be created..
CloudFormation stack changeset
-------------------------------------------------------------------------------------------------------------------------------------
Operation LogicalResourceId ResourceType Replacement
-------------------------------------------------------------------------------------------------------------------------------------
+ Add HelloWorldFunctionVersionfd... AWS::Lambda::Version N/A
* Modify HelloWorldFunctionAliaslive AWS::Lambda::Alias False
* Modify HelloWorldFunction AWS::Lambda::Function False
- Delete HelloWorldFunctionVersion... AWS::Lambda::Version N/A
-------------------------------------------------------------------------------------------------------------------------------------
Changeset created successfully. arn:aws:cloudformation...:...:changeSet/samcli-deploy.../...
Previewing CloudFormation changeset before deployment
======================================================
Additional environment details
- OS: macOS 15.6.1
- If using the SAM CLI,
sam --version: SAM CLI, version 1.144.0 - AWS region: eu-central-1