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+---
+layout: post
+title: "Announcing rustup 1.28.1"
+author: The Rustup Team
+---
+
+The rustup team is happy to announce the release of rustup version 1.28.1.
+[Rustup][install] is the recommended tool to install [Rust][rust], a programming language that is empowering everyone to build reliable and efficient software.
+
+## Challenges with rustup 1.28.0
+
+rustup 1.28.0 was a significant release with many changes, and there was a quick response from many
+folks that this release broke their processes. While we considered yanking the release, we worried
+that this would cause problems for people who had already updated to adopt some of the changes.
+Instead, we are rolling forward with 1.28.1 today and potentially further bugfix releases to
+address the feedback that comes in.
+
+We value all constructive feedback -- please keep it coming in the [issue tracker]. In particular,
+the change with regard to implicit toolchain installation is being discussed in [this issue].
+
+[this issue]: https://github.com/rust-lang/rustup/issues/4211
+[issue tracker]: https://github.com/rust-lang/rustup/issues/
+
+## What's new in rustup 1.28.1
+
+This release contains the following fixes:
+
+- Automatic install is enabled by default but can be opted out by setting `RUSTUP_AUTO_INSTALL`
+  environment variable to `0`. [pr#4214] [pr#4227]
+- `rustup show active-toolchain` will only print a single line, as it did in 1.27. [pr#4221]
+- Fixed a bug in the reqwest backend that would erroneously timeout downloads after 30s. [pr#4218]
+- Use relative symlinks for proxies. [pr#4226]
+
+[1.28.1]: https://github.com/rust-lang/rustup/releases/tag/1.28.1
+[pr#4214]: https://github.com/rust-lang/rustup/pull/4214
+[pr#4221]: https://github.com/rust-lang/rustup/pull/4221
+[pr#4218]: https://github.com/rust-lang/rustup/pull/4218
+[pr#4226]: https://github.com/rust-lang/rustup/pull/4226
+[pr#4227]: https://github.com/rust-lang/rustup/pull/4227
+
+## How to update
+
+If you have a previous version of rustup installed, getting rustup 1.28.1 is as easy as stopping
+any programs which may be using Rustup (e.g. closing your IDE) and running:
+
+```console
+$ rustup self update
+```
+
+Rustup will also automatically update itself at the end of a normal toolchain update:
+
+```console
+$ rustup update
+```
+
+If you don't have it already, you can [get rustup][install] from the appropriate page on our website.
+
+Rustup's documentation is also available in [the rustup book][book].
+
+## Caveats
+
+Rustup releases can come with problems not caused by rustup itself but just due to having a new release.
+As such, we recommend paying attention to the following potential issues in particular:
+
+- Anti-malware scanners might be blocking rustup or stopping it from creating or copying files
+  (especially when installing `rust-docs`, since it contains many small files).
+
+- In your CI environment, rustup might fail when trying to perform a self-update.
+
+  This is a [known issue](https://github.com/rust-lang/rustup/issues/3709),
+  and in the case where this issue does occur, we recommend applying the following workaround at the beginning of your workflow:
+
+  ```console
+  $ rustup set auto-self-update disable
+  ```
+
+  Also, starting from 1.28.0, rustup will no longer attempt to self-update in CI environments,
+  so this workaround should not be necessary in the future.
+
+These issues should be automatically resolved in a few weeks when the anti-malware scanners are updated to be aware of the new rustup release,
+and the hosted version is updated across all CI runners.
+
+## Thanks
+
+Thanks to the rustup and t-release team members who came together to quickly address these issues.
+
+[book]: https://rust-lang.github.io/rustup/
+[changelog]: https://github.com/rust-lang/rustup/blob/stable/CHANGELOG.md
+[contributors]: https://github.com/rust-lang/rustup/blob/stable/CHANGELOG.md#detailed-changes
+[install]: https://rustup.rs
+[rust]: https://www.rust-lang.org