# Contracts 4.0 Timeline

**URL:** <https://forum.openzeppelin.com/t/contracts-4-0-timeline/5774>\
**Category:** Announcements\
**Created:** [February 12, 2021, 9:51pm UTC](https://forum.openzeppelin.com/t/contracts-4-0-timeline/5774 "2021-02-12T21:51:38Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![frangio](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/frangio/32/15251_2.png) [@frangio](https://forum.openzeppelin.com/u/frangio)\
**Post date:** [February 24, 2021, 1:16am UTC](https://forum.openzeppelin.com/t/contracts-4-0-timeline/5774/9 "2021-02-24T01:16:01Z")

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See the Beta announcement:

> [@OpenZeppelin Contracts 4.0 Beta](https://forum.openzeppelin.com/t/openzeppelin-contracts-4-0-beta/5878):
>
> Due to the new built-in overflow checks in Solidity 0.8, which mark the end of the SafeMath era, this upcoming release of OpenZeppelin Contracts is a new major version of the library. We used this opportunity to include a few small breaking changes that we had in the backlog. We’re putting out a beta release to ask for feedback on these changes, and to ask if there are any other breaking changes that people think should be included. If you want to support the project check out the no…

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