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`/docs/rest-api/sdk/environment/update-a-custom-environment` does not exist. Similar pages:

- [Update a custom environment (Vercel SDK)](/docs/rest-api/sdk/environment/update-a-custom-environment.md): PATCH /v9/projects/{idOrName}/customenvironments/{environmentSlugOrId} Update a custom environment for the project. Must not be named 'Production' or
- [Update a custom environment](/docs/rest-api/environment/update-a-custom-environment.md): PATCH /v9/projects/{idOrName}/customenvironments/{environmentSlugOrId} Update a custom environment for the project. Must not be named 'Production' or
- [Create a custom environment for the current project. (Vercel SDK)](/docs/rest-api/sdk/environment/create-a-custom-environment-for-the-current-project.md): POST /v9/projects/{idOrName}/customenvironments Creates a custom environment for the current project. Cannot be named 'Production' or 'Preview'.
- [Retrieve a custom environment (Vercel SDK)](/docs/rest-api/sdk/environment/retrieve-a-custom-environment.md): GET /v9/projects/{idOrName}/customenvironments/{environmentSlugOrId} Retrieve a custom environment for the project. Must not be named 'Production' or
- [Updates one or more shared environment variables (Vercel SDK)](/docs/rest-api/sdk/environment/updates-one-or-more-shared-environment-variables.md): PATCH /v1/env Updates a given Shared Environment Variable for a Team. Categoryenvironment SDK@vercel/sdk (npm i @vercel/sdk)

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