Let us learn about Functions_Extension_Version in this article.


By using the Functions_Extension_Version application settings, you can target a particular version for your Azure Function App. You can also use it if you want to update the version of your Azure Function to a previous or current version.

The value of the Functions_Extension_Version can be like ~3, ~2, ~1, etc. To change it’s value, you can follow the below steps

Login to the Azure Portal (

Navigate to the Azure Function App, click on the configuration from the left navigation, and then click FUNCTIONS_EXTENSION_VERSION.


Once you click on that, You can change the FUNCTIONS_EXTENSION_VERSION value and then click on the OK button as shown below

azure function app runtime version

The next step is to click the Save button on the Application settings page to update the changes.

Wrapping Up

In this article, we discussed Functions_Extension_Version. Thanks for reading this article !!!