{
  "slug": "azure-functions-runtime-1-x-end-of-support",
  "title": "Azure Functions: runtime version 1.x end of support",
  "summary": "End of support date for version 1.x of the Azure Functions runtime: 14 Sep 2026. The version can still be used after that date but no longer receives support or software and security updates.",
  "cloud": "azure",
  "service": "Azure Functions",
  "service_slug": "functions",
  "category": "feature",
  "type": "end_of_support",
  "announced_date": "2023-09-29",
  "effective_date": "2026-09-14",
  "effective_precision": "day",
  "impact": "Support for version 1.x of the Azure Functions runtime ends on 14 Sep 2026. Version 1.x can still be used beyond that date, but it is no longer supported and no longer receives software or security updates.",
  "migration_path": "To stay on a supported version, [migrate to version 4.x of the Azure Functions runtime](https://aka.ms/v1-af-dotnet-migration) by the end of support date.",
  "replacement": "Azure Functions runtime version 4.x",
  "affected_versions": [
    "1.x"
  ],
  "source_url": "https://azure.microsoft.com/updates?id=support-for-the-1x-version-of-azure-functions-ends-14-september-2026",
  "extra_source_urls": [
    "https://aka.ms/v1-af-dotnet-migration",
    "https://learn.microsoft.com/en-us/azure/azure-functions/functions-versions"
  ],
  "vendor_ref": "support-for-the-1x-version-of-azure-functions-ends-14-september-2026",
  "last_checked_at": "2026-11-12T09:55:19.345Z",
  "created_at": "2026-11-13T13:36:44.208Z",
  "updated_at": "2026-11-13T13:36:44.208Z",
  "url": "https://eolwatch.dev/items/azure-functions-runtime-1-x-end-of-support",
  "short_url": "https://eolwatch.dev/i/k",
  "markdown_url": "https://eolwatch.dev/items/azure-functions-runtime-1-x-end-of-support.md",
  "json_url": "https://eolwatch.dev/items/azure-functions-runtime-1-x-end-of-support.json",
  "estate_check": {
    "resource_types": [
      "azurerm_windows_function_app"
    ],
    "fields": [
      "functions_extension_version"
    ],
    "inputs": [
      "Terraform state or plan (JSON)"
    ]
  },
  "source_note": null
}