When upgrading Amplify packages, it is important to make sure that there are no duplicate versions of Amplify packages in the `node_modules` folder tree as a result of the upgrade. Having multiple versions of packages can yield unexpected behavior as modules imported in your code might point to versions not configured by Amplify when calling `Amplify.configure`.

A likely scenario that could point to duplicate versions of packages is getting console messages like:
- `Amplify has not been configured correctly`
- `Please make sure the Auth module is configured with a valid Cognito User Pool ID`
- `User pool is not configured`
- `No Auth module registered in Amplify`

To prevent this situation, you can [Check for duplicate versions](#check-for-duplicate-versions), and if duplicate versions exists, then [Upgrade Amplify packages](#upgrade-amplify-packages).
## Check for duplicate versions

The following commands will show you Amplify packages that appear multiple times in your `node_modules` folder. If the output is empty, it means that you don't have duplicate versions of Amplify packages.

<BlockSwitcher>

<Block name="Mac and Linux">

```sh
# Using YARN
yarn list --pattern amplify | \
  grep -o -e '@\?aws-amplify[^ ]*' | \
  sort | uniq | \
  sed -E 's/^(@?[^@]+).*$/\1/g' | \
  uniq -d | sort
```

```sh
# Using NPM
npm ls -all 2>/dev/null | \
  grep -o -e '@\?aws-amplify[^ ]*' | \
  sort | uniq | \
  sed -E 's/^(@?[^@]+).*$/\1/g' | \
  uniq -d | sort
```

</Block>

<Block name="Windows (PowerShell)">

```powershell
# Using YARN
yarn list --pattern amplify |
  Select-String -Pattern  '(@?aws\-amplify[^@]*).*(?<!deduped)$' | 
  %{$_.Matches.Groups[1].value} | Group-Object | 
  Where-Object { $_.Count -gt 1 } | Select-Object -ExpandProperty Name |
  Sort-Object
```

```powershell
# Using NPM
npm ls -all 2>$null |
  Select-String -Pattern  '(@?aws\-amplify[^@]*).*(?<!deduped)$' | 
  %{$_.Matches.Groups[1].value} | Group-Object | 
  Where-Object { $_.Count -gt 1 } | Select-Object -ExpandProperty Name |
  Sort-Object
```

</Block>

</BlockSwitcher>

---

## Upgrade Amplify packages

If you want to update all Amplify packages to the `latest` versions from npm, run the following command, it will also make sure that only one version of every Amplify package is installed.

<BlockSwitcher>

<Block name="Mac and Linux">

```sh
# Using YARN
yarn upgrade --latest --pattern aws-amplify
```

```sh
# Using NPM
npx npm-check-updates -i '/@?aws-amplify/' && npm update
```

</Block>

<Block name="Windows (PowerShell)">

```powershell
# Using YARN
yarn upgrade --latest --pattern aws-amplify
```

```powershell
# Using NPM
npx npm-check-updates -i '/@?aws-amplify/' && npm update
```

</Block>

</BlockSwitcher>