# Random numbers, with MersenneTwister, not stable across major releases

**URL:** <https://discourse.julialang.org/t/random-numbers-with-mersennetwister-not-stable-across-major-releases/122284>\
**Category:** General Usage\
**Tags:** random\
**Created:** [November 5, 2024, 1:07pm UTC](https://discourse.julialang.org/t/random-numbers-with-mersennetwister-not-stable-across-major-releases/122284 "2024-11-05T13:07:52Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![stevengj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stevengj/32/71_2.png) [@stevengj](https://discourse.julialang.org/u/stevengj)\
**Post date:** [November 5, 2024, 1:13pm UTC](https://discourse.julialang.org/t/random-numbers-with-mersennetwister-not-stable-across-major-releases/122284/3 "2024-11-05T13:13:13Z")

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> [@leolo](#):
>
> Isn’t this supposed to be stable across releases?

No. See: [Random Numbers: Reproducibility](https://docs.julialang.org/en/v1/stdlib/Random/#Reproducibility) in the manual. (NumPy adopted a [similar policy](https://numpy.org/neps/nep-0019-rng-policy.html).)

Also previous discussions, such as [A stable RNG for tests: request for feed-back](https://discourse.julialang.org/t/a-stable-rng-for-tests-request-for-feed-back/38195) and [How to generate reproducible random numbers across versions via package manifest? - #19 by Sukera](https://discourse.julialang.org/t/how-to-generate-reproducible-random-numbers-across-versions-via-package-manifest/65690/19)

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