# Warning: The version of DFX used (0.6.10) is different than the version being run (0.6.12)

**URL:** <https://forum.dfinity.org/t/warning-the-version-of-dfx-used-0-6-10-is-different-than-the-version-being-run-0-6-12/1627>\
**Category:** Developers\
**Created:** [December 5, 2020, 7:48pm UTC](https://forum.dfinity.org/t/warning-the-version-of-dfx-used-0-6-10-is-different-than-the-version-being-run-0-6-12/1627 "2020-12-05T19:48:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Aaron](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/aaron/32/73_2.png) [@Aaron](https://forum.dfinity.org/u/Aaron)\
**Post date:** [December 5, 2020, 7:48pm UTC](https://forum.dfinity.org/t/warning-the-version-of-dfx-used-0-6-10-is-different-than-the-version-being-run-0-6-12/1627/1 "2020-12-05T19:48:12Z")

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Hi all. I’m stumbling at the beginning. DFX --version shows 0.6.12 but I get this error when trying to build.

Do I need to delete an old versions of DFX?

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**Author:** ![Ori](https://avatars.discourse-cdn.com/v4/letter/o/ecae2f/32.png) [@Ori](https://forum.dfinity.org/u/Ori)\
**Post date:** [December 5, 2020, 8:09pm UTC](https://forum.dfinity.org/t/warning-the-version-of-dfx-used-0-6-10-is-different-than-the-version-being-run-0-6-12/1627/2 "2020-12-05T20:09:06Z")

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Check the version no written in your project’s dfx.json file, this determines the version that is run.