cloudflare/workers-sdk miniflare@4.20260507.0 on GitHub

Minor Changes

#13836 039bada Thanks @Skye-31! - Support named recipients in the Email Sending API MessageBuilder
The send_email binding's MessageBuilder now accepts EmailAddress objects for to, cc, and bcc in addition to plain strings. You can mix named and plain addresses in the same array:
```
await env.SEND_EMAIL.send({
  from: "sender@example.com",
  to: [
    "plain@example.com",
    '"Name" <address@example.com>',
    { name: "Jane Doe", email: "jane@example.com" },
  ],
  cc: [{ name: "CC Person", email: "cc@example.com" }],
  subject: "Hello",
  text: "...",
});
```
Additionally, addresses in "Name" <address> format are now correctly parsed when checking allowed_destination_addresses and allowed_sender_addresses restrictions.
#13776 1a54ac5 Thanks @petebacondarwin! - Default the workerd runtime subprocess to TZ=UTC to match the production Cloudflare runtime
Previously, Miniflare inherited the host machine's timezone, so Date and Intl APIs inside a Worker observed the developer's local timezone during local development but UTC in production. This caused dev/prod drift that was hard to debug.
Miniflare now sets TZ=UTC on the spawned workerd subprocess by default. A new unsafeRuntimeEnv option (a Record<string, string>) is available on the Miniflare constructor for advanced cases that need to override the default — for example, to test timezone-dependent behaviour:
```
new Miniflare({
  modules: true,
  script: "...",
  unsafeRuntimeEnv: { TZ: "Europe/London" },
});
```

Patch Changes

#13829 2284f20 Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"
The following dependency versions have been updated:

Dependency From To

workerd 1.20260504.1 1.20260506.1
#13841 332f527 Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"
The following dependency versions have been updated:

Dependency From To

workerd 1.20260506.1 1.20260507.1