# Develop KCL 2.x Consumers
<a name="developing-consumers-with-kcl-v2"></a>

**Important**  
Amazon Kinesis Client Library (KCL) versions 1.x and 2.x are outdated. KCL 1.x will reach end-of-support on January 30, 2026. We **strongly recommend** that you migrate your KCL applications using version 1.x to the latest KCL version before January 30, 2026. To find the latest KCL version, see [Amazon Kinesis Client Library page on GitHub](https://github.com/awslabs/amazon-kinesis-client). For information about the latest KCL versions, see [Use Kinesis Client Library](kcl.md). For information about migrating from KCL 1.x to KCL 3.x, see [Migrating from KCL 1.x to KCL 3.x](kcl-migration-1-3.md).

This topic shows you how to use version 2.0 of the Kinesis Client Library (KCL). 

For more information about the KCL, see the overview provided in [Developing Consumers Using the Kinesis Client Library 1.x](https://docs.aws.amazon.com/streams/latest/dev/developing-consumers-with-kcl.html).

Choose from the following topics depending on the option you want to use.

**Topics**
+ [Develop a Kinesis Client Library consumer in Java](kcl2-standard-consumer-java-example.md)
+ [Develop a Kinesis Client Library consumer in Python](kcl2-standard-consumer-python-example.md)
+ [Develop enhanced fan-out consumers with KCL 2.x](building-enhanced-consumers-kcl-retired.md)