# Runtime versions using Python and Selenium Webdriver
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The following sections contain information about the CloudWatch Synthetics runtime versions for Python and Selenium Webdriver. Selenium is an open-source browser automation tool. For more information about Selenium, see [ www.selenium.dev/](https://www.selenium.dev)

For features and methods supported by Synthetics runtime on Selenium framework, see [Python and Selenium library classes and functions that apply to UI canaries only ](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Synthetics_Canaries_Library_Python.html#CloudWatch_Synthetics_Library_Python_UIcanaries) and [Selenium API reference](https://www.selenium.dev/selenium/docs/api/py/api.html).

The naming convention for these runtime versions is `syn-language -framework-majorversion. minorversion`.

## syn-python-selenium-10.0
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Version 10.0 is the newest CloudWatch Synthetics runtime for Python and Selenium.

**Major dependencies**:
+ Python 3.11
+ Selenium 4.32.0
+ Chromium version 145.0.7632.77

**Changes in syn-python-selenium-10.0 ** 
+ Applied security patches and updated browser versions.

For more information, see the following:
+  [Selenium Change log](https://www.selenium.dev/blog/2025/selenium-4-32-released) 
+  [Selenium documentation](https://www.selenium.dev/selenium/docs/api/py/api.html) 

## Previous runtime versions for Python and Selenium
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The following earlier runtime versions for Python and Selenium are still supported. 

### syn-python-selenium-9.0
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**Major dependencies**:
+ Python 3.11
+ Selenium 4.32.0
+ Chromium version 143.0.7499.169

**Changes in syn-python-selenium-9.0 ** 
+ Applied security patches and updated browser versions.

For more information, see the following:
+  [Selenium Change log](https://www.selenium.dev/blog/2025/selenium-4-32-released) 
+  [Selenium documentation](https://www.selenium.dev/selenium/docs/api/py/api.html) 

### syn-python-selenium-8.0
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Version 8.0 is the newest CloudWatch Synthetics runtime for Python and Selenium.

**Major dependencies**:
+ Python 3.11
+ Selenium 4.32.0
+ Chromium version 142.0.7444.175

**Changes in syn-python-selenium-8.0 ** 
+ Applied security patches and updated Selenium and browser versions.
+ Modified failed HAR network request log level from ERROR to INFO.

For more information, see the following:
+  [Selenium Change log](https://www.selenium.dev/blog/2025/selenium-4-32-released) 
+  [Selenium documentation](https://www.selenium.dev/selenium/docs/api/py/api.html) 

### syn-python-selenium-7.0
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**Major dependencies**:
+ Python 3.11
+ Selenium 4.32.0
+ Chromium version 138.0.7204.168

 **Changes in syn-python-selenium-7.0 ** 
+ Applied security patches and updated Selenium and browser versions.

For more information, see the following:
+  [Selenium Change log](https://www.selenium.dev/blog/2025/selenium-4-32-released) 
+  [Selenium documentation](https://www.selenium.dev/selenium/docs/api/py/api.html) 

### syn-python-selenium-6.0
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**Major dependencies**:
+ Python 3.11
+ Selenium 4.21.0
+ Chromium version 131.0.6778.264

 **Changes in syn-python-selenium-6.0** 
+ Upgrade from Python 3.9 to Python 3.11.

For more information, see the following:
+  [Selenium Change log](https://www.selenium.dev/blog/2024/selenium-4-21-released/) 
+  [Selenium documentation](https://www.selenium.dev/selenium/docs/api/py/api.html) 

### syn-python-selenium-5.1
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**Major dependencies**:
+ Python 3.9
+ Selenium 4.21.0
+ Chromium version 131.0.6778.264

 **Changes in syn-python-selenium-5.1** 
+ Minor updates on metric emission.
+ Supports dry runs for the canary which allows for adhoc executions or performing a safe canary update.

### syn-python-selenium-5.0
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**Major dependencies**:
+ Python 3.9
+ Selenium 4.21.0
+ Chromium version 131.0.6778.264

**Changes in syn-python-selenium-5.0**:
+ Automatic retry if the browser fails to launch.

### syn-python-selenium-4.1
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**Major dependencies**:
+ Python 3.9
+ Selenium 4.15.1
+ Chromium version 126.0.6478.126

**Changes in syn-python-selenium-4.1**:
+ **Addresses security vulnerability**– This runtime has an update to address the [CVE-2024-39689](https://nvd.nist.gov/vuln/detail/CVE-2024-39689) vulnerability.

### syn-python-selenium-4.0
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**Major dependencies**:
+ Python 3.9
+ Selenium 4.15.1
+ Chromium version 126.0.6478.126

**Changes in syn-python-selenium-4.0**:
+ **Bug fixes** for errors in HAR parser logging.

## Deprecated runtime versions for Python and Selenium
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The following earlier runtime versions for Python and Selenium have been deprecated. For information about runtime deprecation dates, see [CloudWatch Synthetics runtime deprecation dates](CloudWatch_Synthetics_Runtime_Support_Policy.md#runtime_deprecation_dates).

### syn-python-selenium-3.0
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**Major dependencies**:
+ Python 3.8
+ Selenium 4.15.1
+ Chromium version 121.0.6167.139

**Changes in syn-python-selenium-3.0**:
+ **Updated versions of the bundled libraries in Chromium**— The Chromium dependency is updated to a new version.

### syn-python-selenium-2.1
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**Major dependencies**:
+ Python 3.8
+ Selenium 4.15.1
+ Chromium version 111.0.5563.146

**Changes in syn-python-selenium-2.1**:
+ **Updated versions of the bundled libraries in Chromium**— The Chromium and Selenium dependencies are updated to new versions.

### syn-python-selenium-2.0
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**Major dependencies**:
+ Python 3.8
+ Selenium 4.10.0
+ Chromium version 111.0.5563.146

**Changes in syn-python-selenium-2.0**:
+ **Updated dependencies**— The Chromium and Selenium dependencies are updated to new versions.

**Bug fixes in syn-python-selenium-2.0**:
+ **Timestamp added**— A timestamp has been added to canary logs.
+ **Session re-use**— A bug was fixed so that canaries are now prevented from reusing the session from their previous canary run.

### syn-python-selenium-1.3
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**Major dependencies**:
+ Python 3.8
+ Selenium 3.141.0
+ Chromium version 92.0.4512.0

**Changes in syn-python-selenium-1.3**:
+ **More precise timestamps**— The start time and stop time of canary runs are now precise to the millisecond.

### syn-python-selenium-1.2
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**Major dependencies**:
+ Python 3.8
+ Selenium 3.141.0
+ Chromium version 92.0.4512.0
+ **Updated dependencies**— The only new features in this runtime are the updated dependencies.

### syn-python-selenium-1.1
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**Major dependencies**:
+ Python 3.8
+ Selenium 3.141.0
+ Chromium version 83.0.4103.0

**Features**:
+ **Custom handler function**— You can now use a custom handler function for your canary scripts. Previous runtimes required the script entry point to include `.handler`. 

  You can also put canary scripts in any folder and pass the folder name as part of the handler. For example, `MyFolder/MyScriptFile.functionname` can be used as an entry point.
+ **Configuration options for adding metrics and step failure configurations**— These options were already available in runtimes for Node.js canaries. For more information, see [SyntheticsConfiguration class](CloudWatch_Synthetics_Canaries_Library_Python.md#CloudWatch_Synthetics_Library_SyntheticsConfiguration_Python) .
+ **Custom arguments in Chrome **— You can now open a browser in incognito mode or pass in proxy server configuration. For more information, see [Chrome()](CloudWatch_Synthetics_Canaries_Library_Python.md#CloudWatch_Synthetics_Library_Python_Chrome).
+ **Cross-Region artifact buckets**— A canary can store its artifacts in an Amazon S3 bucket in a different Region.
+ **Bug fixes, including a fix for the `index.py` issue**— With previous runtimes, a canary file named ` index.py` caused exceptions because it conflicted with the name of the library file. This issue is now fixed.

### syn-python-selenium-1.0
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**Major dependencies**:
+ Python 3.8
+ Selenium 3.141.0
+ Chromium version 83.0.4103.0

**Features**:
+ **Selenium support**— You can write canary scripts using the Selenium test framework. You can bring your Selenium scripts from elsewhere into CloudWatch Synthetics with minimal changes, and they will work with AWS services.