---
title: "Surviving the upgrade to Dart 3.5.0"
description: "Troubleshooting guide for common errors and fixes when upgrading Flutter apps to Dart 3.5.0, based on issues we hit at Shorebird."
url: https://shorebird.dev/blog/dart-3-5-0/
---

[Blog](/blog)

[Guides](/blog/category/guides) August 16, 2024 2 min read

# Surviving the upgrade to Dart 3.5.0

Troubleshooting when upgrading to Dart 3.5.0.

![](/_astro/bryan-oltman.TgpL39LN_Z15wJDk.webp)

Bryan Oltman

Founding Engineer

One of the big features of [Flutter 3.24.0](https://medium.com/flutter/whats-new-in-flutter-3-24-6c040f87d1e4) is an upgrade to Dart 3.5.0, which comes with a whole bunch of [nice changes](https://medium.com/dartlang/dart-3-5-6ca36259fa2f). Unfortunately, like all software releases, it also came with some bugs.

We encountered some bugs when upgrading our projects at Shorebird and have listed the problems and workarounds we found here:

## ../.pub-cache/hosted/pub.dev/win32-5.5.0/lib/src/guid.dart:32:9: Error: Type ‘UnmodifiableUint8ListView’ not found.

We were [not](https://github.com/jonataslaw/get_cli/issues/263) [alone](https://github.com/orgs/codemagic-ci-cd/discussions/2678) in seeing this issue. Fortunately, the fix is fairly straightforward:

```
flutter pub cache clean
flutter pub upgrade
```

If you track your `pubspec.lock` file in source control (tip: you should!), you should see that the `win32` dependency has been upgraded, and you should now be able to build.

## None of your analysis warnings show up in Visual Studio Code.

If:

1. Your `pubspec.yaml` file is not at the root of your repo (or “workspace”)
2. Your `analysis_options.yaml` file uses an “import” to pull in rules from another file (the default Flutter and Dart templates include `package:lints` or `package:flutter_lints`).

This can be worked around by adding a `pubspec.yaml` at the root of your checkout/workspace. This is what we’ve used:

```
# This file is a workaround for https://github.com/dart-lang/sdk/issues/56047
name: your_project_name_here
environment:
  sdk: ^3.5.0
dev_dependencies:
  very_good_analysis: ^6.0.0
```

The above example uses [very_good_analysis](https://pub.dev/packages/very_good_analysis) (which is the lints package we use at [Shorebird](https://shorebird.dev)), but you can easily change the above to use [package:lints](https://pub.dev/packages/lints) or [package:flutter_lints](https://pub.dev/packages/flutter_lints) or whatever analysis imports you depend on.

You can test that this is working by introducing an error in one of your packages not at the root of your repo and you should once again see that error in the “Problems” tab of Visual Studio Code.

## Conclusion

Did you have trouble with Dart 3.5.0? Did we miss something? We’d love to hear from you. Reach out via [email](mailto:contact@shorebird.dev) or [Discord](https://discord.gg/shorebird) anytime.

## More from the blog

[All posts](/blog)

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  ![](/_astro/abhishek-doshi.DveI0bx__ZfWpAX.webp)

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  Developer Relations Engineer

## Ship your first patch today.

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