This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html). # Release history for CloudFormation helper scripts Release history for helper scripts The following table describes the changes to the `aws-cfn-bootstrap` package, which contains the CloudFormation helper scripts. You can also download the latest version of the helper scripts at the following links. These links redirect to the most recent version of the helper scripts listed in the table below. + [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-latest.tar.gz) + [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-latest.zip) + [EXE (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-latest.exe) + [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-win64-latest.exe) **Note** Version 2.0-1 and above of the helper scripts support Python 3.4 and above. If you need helper scripts that support an earlier version of Python, see [Release History for CloudFormation Helper Scripts 1.4](#releasehistory-aws-cfn-bootstrap-v1) . | Version | Release Date | Change Description | Download Packages | | --- | --- | --- | --- | | 2.0-38 (Latest; recommended) | 12/4/2025 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-36 | 9/2/2025 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-34 | 4/9/2025 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-33 | 2/27/2025 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-32 | 1/8/2025 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-31 | 10/9/2024 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-29 | 2/8/2024 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-28 | 10/12/2023 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-27 | 09/12/2023 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-26 | 08/9/2023 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-25 | 05/2/2023 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-24 | 02/20/2023 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-22 | 02/6/2023 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-21 | 01/9/2023 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-19 | 11/8/2022 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-18 | 10/31/2022 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-17 | 10/24/2022 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-16 | 08/19/2022 | Addressing issues with temp files being locked when logging commands for Windows . | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-15 | 07/28/2022 | Bug fixes issue causing some commands in Windows to fail. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-14 | 07/20/2022 | Update for Windows installers to use Python 3.9.13 version. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-12 | 6/13/2022 | Bug fixes for issues on Windows AMI caused by the KB5010359 security patch. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-10 | 1/11/2022 | Added support for `Zypper` package manager and `systemd` service management tool. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-6 | 3/17/2021 | Bug fixes for: [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-5 | 3/5/2021 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-4 | 2/3/2021 | Updated Visual Studio C\$1\$1 2010 redistributable. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-3 | 1/8/2021 | Windows installer succeeds even if a newer Visual Studio C\$1\$1 Redistributable is already installed. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-2 | 9/14/2020 | The default and user specified interval for `cfn-hup` has an accuracy of plus or minus 30 seconds. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 2.0-1 | 6/24/2020 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | ## Release History for CloudFormation Helper Scripts 1.4 The table below provides access to previous versions of the helper scripts, which support Python version 2.7 and 2.6. It is provided for backwards compatibility. We recommend using the latest version of the helper scripts, which require Python 3.4 or above. **Note** The CloudFormation helper scripts are preinstalled on Amazon Linux AMI images. The download packages listed in the table apply to other Linux/Unix distributions and Microsoft Windows (2008 or later). To learn how to use the helper scripts, see the [CloudFormation helper scripts reference](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/cfn-helper-scripts-reference.html) . | Version | Release date | Change description | Download packages | | --- | --- | --- | --- | | 1.4-34 | 9/14/2020 | The default and user specified interval for `cfn-hup` has an accuracy of plus or minus 30 seconds. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-33 | 5/28/2020 | Supports Python 2.6 and 2.7. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-32 | | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | | 1.4-31 | 9/10/2018 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-30 | 3/21/2018 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-29 | 2/12/2018 | Extending support for newer AWS Regions. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-27 | 1/24/2018 | Extending support for newer AWS Regions. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-24, 1.4-26 | 10/12/2017 | Fixed an incompatibility for customers using an older version of Python. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-23 | 10/3/2017 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-22 | 9/14/2017 | Changed `umask` default value from `0` to `0022`. | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-21 | 8/31/2017 | Added the `umask` parameter for the `cfn-hup` daemon, with a default value of `0` . | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-20 | 8/2/2017 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | | 1.4-19 | 7/20/2017 | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) | [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/releasehistory-aws-cfn-bootstrap.html) |