# Upgrade tool cakephp4 not working

**URL:** <https://discourse.cakephp.org/t/upgrade-tool-cakephp4-not-working/8841>\
**Category:** Uncategorized\
**Created:** [January 7, 2021, 12:49am UTC](https://discourse.cakephp.org/t/upgrade-tool-cakephp4-not-working/8841 "2021-01-07T00:49:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jagguy](https://avatars.discourse-cdn.com/v4/letter/j/b487fb/32.png) [@jagguy](https://discourse.cakephp.org/u/jagguy)\
**Post date:** [January 7, 2021, 12:49am UTC](https://discourse.cakephp.org/t/upgrade-tool-cakephp4-not-working/8841/1 "2021-01-07T00:49:02Z")

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I have a cakephp version 3.9 with code from version 3.2  
I want to upgrade to cakephp4 using the upgrade tool.  
Does the upgrade tool change cake3 syntax to 4?

these commands are not working  
bin/cake upgrade rector --rules phpunit80 \<path/to/app/tests\>  
bin/cake upgrade rector --rules cakephp40 \<path/to/app/src\>

[https://book.cakephp.org/4/en/appendices/4-0-upgrade-guide.html](https://book.cakephp.org/4/en/appendices/4-0-upgrade-guide.html)

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<div class="post-metadata">

**Author:** ![ishan](https://yyz1.discourse-cdn.com/flex029/user_avatar/discourse.cakephp.org/ishan/32/2589_2.png) [@ishan](https://discourse.cakephp.org/u/ishan)\
**Post date:** [January 8, 2021, 6:16pm UTC](https://discourse.cakephp.org/t/upgrade-tool-cakephp4-not-working/8841/2 "2021-01-08T18:16:57Z")

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Are you facing any errors? Please provide error message along with stack trace (and screen shot if possible), so people can help you.