---
title: "Nutrient 6.6 migration guide"
canonical_url: "https://www.nutrient.io/guides/android/migration-guides/pspdfkit-6-6-migration-guide/"
md_url: "https://www.nutrient.io/guides/android/migration-guides/pspdfkit-6-6-migration-guide.md"
last_updated: "2026-06-09T10:25:14.344Z"
description: "Discover essential steps for migrating to Nutrient Android SDK 6.6, including updates on build systems and removal of deprecated dependencies."
---

This article provides a set of guidelines for migrating from Nutrient Android SDK 6.5 to Nutrient Android SDK 6.6.

## Dependency and build system updates

With Nutrient 6.6, we updated various build properties and versions.

- Changed: The Android Gradle plugin used to build Nutrient was updated to version `4.1.1`. All sample applications now use Android Gradle plugin `4.1.1` as well.

- Changed: `org.jetbrains.kotlin:kotlin-stdlib` was updated to version `1.4.21`

## Removed device year class dependency

[Device Year Class](https://github.com/facebook/device-year-class) is a deprecated library from Facebook that analyzes an Android device’s specifications. With Nutrient Android SDK 6.6, we removed the Device Year Class transitive dependency in favor of a simpler in-house algorithm that works by following similar principles to optimize the default configuration.

> **❗ Important:** Follow the next step only if you manually integrated the Nutrient `.aar` file. If you used Maven/Gradle for integrating Nutrient, Device Year Class has already been removed for you.

Inside the `dependencies` block of your `app/build.gradle`, remove the following line:

```diff

dependencies {

-    implementation 'com.facebook.device.yearclass:yearclass:2.0.0'
}

```
---

## Related pages

- [10 3 Migration Guide](/guides/android/migration-guides/10-3-migration-guide.md)
- [10 4 Migration Guide](/guides/android/migration-guides/10-4-migration-guide.md)
- [10 5 Migration Guide](/guides/android/migration-guides/10-5-migration-guide.md)
- [2024 9 Migration Guide](/guides/android/migration-guides/2024-9-migration-guide.md)
- [2024 8 Migration Guide](/guides/android/migration-guides/2024-8-migration-guide.md)
- [Pspdfkit 2 1 Migration Guide](/guides/android/migration-guides/pspdfkit-2-1-migration-guide.md)
- [Migrate to electronic signatures](/guides/android/migration-guides/migrating-to-electronic-signatures.md)
- [Nutrient 10 Migration Guide](/guides/android/migration-guides/nutrient-10-migration-guide.md)
- [Pspdfkit 2024 2 Migration Guide](/guides/android/migration-guides/pspdfkit-2024-2-migration-guide.md)
- [Pspdfkit 2024 1 Migration Guide](/guides/android/migration-guides/pspdfkit-2024-1-migration-guide.md)
- [Pspdfkit 2024 3 Migration Guide](/guides/android/migration-guides/pspdfkit-2024-3-migration-guide.md)
- [Pspdfkit 2024 4 Migration Guide](/guides/android/migration-guides/pspdfkit-2024-4-migration-guide.md)
- [Pspdfkit 2024 7 Migration Guide](/guides/android/migration-guides/pspdfkit-2024-7-migration-guide.md)
- [Pspdfkit 2024 6 Migration Guide](/guides/android/migration-guides/pspdfkit-2024-6-migration-guide.md)
- [Pspdfkit 4 4 Migration Guide](/guides/android/migration-guides/pspdfkit-4-4-migration-guide.md)
- [Pspdfkit 3 1 Migration Guide](/guides/android/migration-guides/pspdfkit-3-1-migration-guide.md)
- [Migrate to Nutrient 3.0 with ease](/guides/android/migration-guides/pspdfkit-3-migration-guide.md)
- [Pspdfkit 5 1 Migration Guide](/guides/android/migration-guides/pspdfkit-5-1-migration-guide.md)
- [Pspdfkit 5 2 Migration Guide](/guides/android/migration-guides/pspdfkit-5-2-migration-guide.md)
- [Pspdfkit 5 3 Migration Guide](/guides/android/migration-guides/pspdfkit-5-3-migration-guide.md)
- [Pspdfkit 6 1 Migration Guide](/guides/android/migration-guides/pspdfkit-6-1-migration-guide.md)
- [Pspdfkit 5 5 Migration Guide](/guides/android/migration-guides/pspdfkit-5-5-migration-guide.md)
- [Migration guide for Android SDK 4 features](/guides/android/migration-guides/pspdfkit-4-migration-guide.md)
- [Pspdfkit 6 3 Migration Guide](/guides/android/migration-guides/pspdfkit-6-3-migration-guide.md)
- [Pspdfkit 6 2 Migration Guide](/guides/android/migration-guides/pspdfkit-6-2-migration-guide.md)
- [Pspdfkit 7 Migration Guide](/guides/android/migration-guides/pspdfkit-7-migration-guide.md)
- [Pspdfkit 6 4 Migration Guide](/guides/android/migration-guides/pspdfkit-6-4-migration-guide.md)
- [Pspdfkit 5 Migration Guide](/guides/android/migration-guides/pspdfkit-5-migration-guide.md)
- [Pspdfkit 8 7 Migration Guide](/guides/android/migration-guides/pspdfkit-8-7-migration-guide.md)
- [Pspdfkit 6 Migration Guide](/guides/android/migration-guides/pspdfkit-6-migration-guide.md)
- [Pspdfkit 8 6 Migration Guide](/guides/android/migration-guides/pspdfkit-8-6-migration-guide.md)
- [Pspdfkit 8 9 Migration Guide](/guides/android/migration-guides/pspdfkit-8-9-migration-guide.md)
- [Pspdfkit 8 Migration Guide](/guides/android/migration-guides/pspdfkit-8-migration-guide.md)
- [Pspdfkit 8 8 Migration Guide](/guides/android/migration-guides/pspdfkit-8-8-migration-guide.md)
- [Upgrading](/guides/android/advanced-integration/upgrading.md)