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
<a name="releasehistory-aws-cfn-bootstrap"></a>

 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 | 
| --- | --- | --- | --- | 
| 2.0-40<br />(Latest; recommended) | July 16, 2026 |  +  This release removes the bundled OpenSSL. TLS is now handled by the operating system (system OpenSSL on Linux, and WinHTTP/SChannel on Windows). <br />+  This release removes the bundled HTTPS request libraries (requests, urllib3, and chardet). <br />+  This release adds certutil-based certificate authority override support on Windows for air-gapped environments.   | To download the aws-cfn-bootstrap package, choose one of the following links:+   [aws-cfn-bootstrap 2.0-40 (.tar.gz)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-40.tar.gz)  <br />+   [aws-cfn-bootstrap 2.0-40 (.zip)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-40.zip)  <br />+   [aws-cfn-bootstrap 2.0-40 installer (.exe, 64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-40.win64.exe)   | 
| 2.0-39 | April 30, 2026 |  +  Build Windows executable using Python 3.13.13 <br />+  Replace pkg\_resources with pkgutil for setuptools compatibility <br />+  Remove setuptools as runtime dependency   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-39.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-39.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-39.win64.exe)    | 
| 2.0-38 | 12/4/2025 |  +  Use HTTPS Requests Library v2.32.4 <br />+  Build Windows executable using Python 3.13.9 <br />+  Update endpoints for EU ADC regions   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-38.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-38.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-38.win64.exe)    | 
| 2.0-36 | 9/2/2025 |  +  Update service endpoints   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-36.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-36.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-36.win64.exe)    | 
| 2.0-34 | 4/9/2025 |  +  Handle errors when MD5 checksum for S3 objects is unavailable <br />+  Build Windows executable using Python 3.11.12.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-34.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-34.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-34.win64.exe)    | 
| 2.0-33 | 2/27/2025 |  +  When using config.packages.yum, clean the yum metadata before making the cache <br />+  Remove occurrences of deprecated SafeConfigParser class <br />+  Qualified file path to resolve a SyntaxWarning   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-33.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-33.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-33.win64.exe)    | 
| 2.0-32 | 1/8/2025 |  +  Updated Visual Studio C\+\+ Redistributable to 14.40.33816.0   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-32.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-32.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-32.win64.exe)    | 
| 2.0-31 | 10/9/2024 |  +  Replaces imp with importlib for newer versions of Python to unblock Linux users upgrading to Python 3.12\+   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-31.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-31.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-31.win64.exe)    | 
| 2.0-29 | 2/8/2024 |  +  Using `pip3` to install Python packages. <br />+  Removed deprecated flags for gem installs. <br />+  Installing `systemd` service file. <br />+  Made all bin/ scripts executable. <br />+  Build Windows executable using Python 3.11.8.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-29.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-29.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-29.win64.exe)    | 
| 2.0-28 | 10/12/2023 |  +  Use `Python-Daemon` 2.2.4. <br />+  Build Windows executable using Python 3.11.6.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-28.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-28.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-28.win64.exe)    | 
| 2.0-27 | 09/12/2023 |  +  Build Windows executable using Python 3.11.5.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-27.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-27.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-27.win64.exe)    | 
| 2.0-26 | 08/9/2023 |  +  Build Windows executable using Python 3.11.4.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-26.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-26.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-26.win64.exe)    | 
| 2.0-25 | 05/2/2023 |  +  Build Windows executable using Python 3.10.11.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-25.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-25.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-25.win64.exe)    | 
| 2.0-24 | 02/20/2023 |  +  Build Windows executable using Python 3.10.10.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-24.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-24.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-24.win64.exe)    | 
| 2.0-22 | 02/6/2023 |  +  Fix to parse URL with port number as string.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-22.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-22.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-22.win64.exe)    | 
| 2.0-21 | 01/9/2023 |  +  Build Windows executable using Python 3.10.9. <br />+  Fix string replacement issue while sending signal via `cfn-signal`. <br />+  Create a symbolic link for all entrypoints in `/usr/bin` for Amazon Linux 2 and AL2023 rpms.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-21.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-21.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-21.win64.exe)    | 
| 2.0-19 | 11/8/2022 |  +   Use chevron in Windows , AL2023 and source distribution having Python >= 3.6 to parse mustache templates.  <br />+  Use `pystache` in Amazon Linux 2 and source distribution having Python 3.6. <br />+  Bump `chardet` to 3.0.4 as `requests` package was throwing non zero exit code.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-19.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-19.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-19.win64.exe)    | 
| 2.0-18 | 10/31/2022 |  +  Drop support for building a binary for 32 bit Windows. <br />+  Fix source distribution installation for customers that already have `setuptools`>57.5.0. <br />+   Build Windows executable using Python 3.10. Bump `py2exe` to 0.12.0.2. Use `pywin32` compatible with Python 3.10.    |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-18.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-18.zip)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-18.win64.exe)    | 
| 2.0-17 | 10/24/2022 |  +  Bump requests so that it is Python 3.10 compatible. <br />+   Addressing file leakage issue for Windows while capturing `stdout` and `stderr` .  <br />+   Added a strict mode to `cfn-init` to eagerly fail the bootstrapping process if rpm metadata cannot be found.  <br />+   Fixed Windows installer failure when Visual Studio 2015-2022 is already installed.  <br />+  Updated endpoints for ADC Regions.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-17.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-17.zip)  <br />+   [EXE (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-17.win32.exe)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-17.win64.exe)    | 
| 2.0-16  | 08/19/2022 |  Addressing issues with temp files being locked when logging commands for Windows .  |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-16.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-16.zip)  <br />+   [EXE (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-16.win32.exe)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-16.win64.exe)    | 
| 2.0-15  | 07/28/2022 | Bug fixes issue causing some commands in Windows to fail. |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-15.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-15.zip)  <br />+   [EXE (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-15.win32.exe)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-15.win64.exe)    | 
| 2.0-14 | 07/20/2022 | Update for Windows installers to use Python 3.9.13 version. |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-14.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-14.zip)  <br />+   [EXE (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-14.win32.exe)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-14.win64.exe)    | 
| 2.0-12  | 6/13/2022 | Bug fixes for issues on Windows AMI caused by the KB5010359 security patch. |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-12.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-12.zip)  <br />+   [EXE (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-12.win32.exe)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-12.win64.exe)    | 
| 2.0-10 | 1/11/2022 |  Added support for `Zypper` package manager and `systemd` service management tool.  |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-10.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-10.zip)  <br />+   [EXE (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-10.win32.exe)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-10.win64.exe)    | 
| 2.0-6 | 3/17/2021 | Bug fixes for:+  Endpoint URLs containing a path. <br />+  Elastic Beanstalk integration.  |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-6.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-6.zip)  <br />+   [EXE (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-6.win32.exe)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-6.win64.exe)    | 
| 2.0-5 | 3/5/2021 |  +  Added Python 3.9.2 DLLs to the Windows installer. <br />+  Updated Visual Studio C\+\+  Redistributable to 14.28.29910.   |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-5.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-5.zip)  <br />+   [EXE (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-5.win32.exe)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-5.win64.exe)    | 
| 2.0-4 | 2/3/2021 | Updated Visual Studio C\+\+ 2010 redistributable. |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-4.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-4.zip)  <br />+   [EXE (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-4.win32.exe)  <br />+   [EXE (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-4.win64.exe)    | 
| 2.0-3 | 1/8/2021 |  Windows installer succeeds even if a newer Visual Studio C\+\+  Redistributable is already installed.  |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-3.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-3.zip)    | 
| 2.0-2 | 9/14/2020 |  The default and user specified interval for `cfn-hup` has an accuracy of plus or minus 30 seconds.  |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-2.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-2.zip)    | 
| 2.0-1 | 6/24/2020 |  +  Support Python 3.4 and above only <br />+  Windows versions support Microsoft Windows 2012 and later. <br />+   For Microsoft Windows , if you currently have a version of the helper scripts between 1.4-15 to 1.4-30 installed, you must uninstall that previous version before installing version 2.0-0.1 and above.    |  +   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-1.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-2.0-1.zip)    | 

## Release History for CloudFormation Helper Scripts 1.4
<a name="releasehistory-aws-cfn-bootstrap-v1"></a>

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.  |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-34.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-34.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-34.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-34.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-34.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-34.win64.msi)    | 
| 1.4-33 | 5/28/2020 | Supports Python 2.6 and 2.7. |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-33.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-33.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-33.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-33.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-33.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-33.win64.msi)    | 
| 1.4-32  |  |  +  Added support for EC2 [Instance metadata service version 2 (IMDSv2)](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html). <br />+  Does not support Python 2.6. <br />+   Available for [manual installation](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/cfn-helper-scripts-reference.html#cfn-helper-scripts-reference-latest-version) only through the `yum` repo.    |   | 
| 1.4-31 | 9/10/2018 |  +  Extending support for newer AWS Regions. <br />+   Fixed issue removing certain older versions of `aws-cfn-bootstrap` when using the Windows installer.    |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-31.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-31.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-31.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-31.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-31.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-31.win64.msi)    | 
| 1.4-30 | 3/21/2018 |  +  Added additional retries on specific network errors. <br />+  Improved `cfn-hup` logging.   |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-30.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-30.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-30.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-30.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-30.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-30.win64.msi)    | 
| 1.4-29  | 2/12/2018 | Extending support for newer AWS Regions. |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-29.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-29.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-29.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-29.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-29.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-29.win64.msi)    | 
| 1.4-27 | 1/24/2018 | Extending support for newer AWS Regions. |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-27.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-27.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-27.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-27.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-27.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-27.win64.msi)    | 
| 1.4-24,<br />1.4-26 | 10/12/2017 | Fixed an incompatibility for customers using an older version of Python. |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-24.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-24.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-24.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-24.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-24.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-24.win64.msi)    | 
| 1.4-23 | 10/3/2017 |  +  Fixed date/time serialization issue. <br />+  Fixed issue logging non-ASCII characters.   |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-23.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-23.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-23.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-23.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-23.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-23.win64.msi)    | 
| 1.4-22 | 9/14/2017 | Changed `umask` default value from `0` to `0022`. |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-22.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-22.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-22.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-22.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-22.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-22.win64.msi)    | 
| 1.4-21 | 8/31/2017 |  Added the `umask` parameter for the `cfn-hup` daemon, with a default value of `0` .  |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-21.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-21.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-21.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-21.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-21.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-21.win64.msi)    | 
| 1.4-20 | 8/2/2017 |  +  Set 0700 permissions to the `/var/lib/cfn-hup/data` directory. <br />+  Set 0700 permissions to the `/var/lib/cfn-init` directory. <br />+   Ensure that we remove all permissions for group and world whenever we update the `metadata_db.json` and `resume_db.json` files.    |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-20.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-20.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-20.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-20.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-20.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-20.win64.msi)    | 
| 1.4-19 | 7/20/2017 |  +   Changed the data format stored into `metadata_db` and `resume_db` files from `shelf` to JSON.  <br />+  Set 0600 permissions to the `/var/lib/cfn-init` directory.   |  +   [RPM](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-19.amzn1.noarch.rpm)  <br />+   [RPM (source files)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-19.amzn1.src.rpm)  <br />+   [TAR.GZ](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-19.tar.gz)  <br />+   [ZIP](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-19.zip)  <br />+   [MSI (32-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-19.win32.msi)  <br />+   [MSI (64-bit Windows)](https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-1.4-19.win64.msi)    |