AzureEnd of support

Azure Functions: .NET 8 and .NET 9 end of support

End of support date for .NET 8 and .NET 9 on Azure Functions: 10 Nov 2026. Function apps keep operating after that date but stop receiving security updates and support.

Support ended 10 Nov 2026Ended 3 days ago, 10 Nov 2026

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What breaks

After the end of support date, function apps on .NET 8 and .NET 9 continue to operate, but security updates are no longer provided and support for these versions on Azure Functions ends. Microsoft states that running function apps on an unsupported runtime or language version might lead to security and performance issues. Apps that use the in-process model must move to the isolated worker model before they can upgrade. Apps on a Linux Consumption plan must first upgrade to the Flex Consumption plan before upgrading to .NET 10.

Who is affected

Affected versions

Matching resource types

microsoft.web/sites
azurerm_linux_function_app
azurerm_windows_function_app

Fields the check reads

linuxfxversion
kind
site_config.application_stack.dotnet_version
site_config.application_stack.use_dotnet_isolated_runtime

Detected by the estate check from

Azure Resource Graph export (CSV or JSON)
Terraform state or plan (JSON)
ARM template

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What to do

If the app uses the in-process model, migrate it to the isolated worker model, then upgrade to .NET 10 (step 3). See Migrate C# Apps from In-Process to Isolated Worker Model.
If the app is on a Linux Consumption plan, upgrade to the Flex Consumption plan before upgrading to .NET 10.
If the app already uses the isolated worker model, upgrade it directly to .NET 10 by following Update Language Versions in Azure Functions.
Complete all required upgrades and confirm the app has moved off the in-process model before 10 Nov 2026.

Replacement

.NET 10

Sources

Official sourceazure.microsoft.comOfficial
Additional sourcelearn.microsoft.comOfficial
Additional sourcelearn.microsoft.comOfficial
Additional sourcelearn.microsoft.comOfficial
Additional sourcelearn.microsoft.comOfficial
Additional sourcelearn.microsoft.comOfficial

Last checked against the first source in this list on 12 Nov 2026.

14 Sep 2026Ended 60 days ago, 14 Sep 2026Azure Functions: runtime version 1.x end of support Source
30 Sep 2026Ended 44 days ago, 30 Sep 2026Azure Functions: runtime v3 on Linux Consumption retirement Source
1 Oct 2026Ended 43 days ago, 1 Oct 2026Azure Functions: Python 3.10 end of support Source
10 Nov 2026Ended 3 days ago, 10 Nov 2026Azure Functions: .NET in-process model end of support Source
10 Nov 2026Ended 3 days ago, 10 Nov 2026Azure Functions: PowerShell 7.4 end of support Source
30 Apr 2027In about 6 months, 30 Apr 2027Azure Functions: Node.js 22 end of support Source

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Last checked 12 Nov 2026 · Added 13 Nov 2026 · Changelog for this item