# Lamdera v1.4.0 - REPLs for lamdera live and CLI

**URL:** <https://discourse.elm-lang.org/t/lamdera-v1-4-0-repls-for-lamdera-live-and-cli/10515>\
**Category:** Show and Tell\
**Created:** [December 31, 2025, 8:36am UTC](https://discourse.elm-lang.org/t/lamdera-v1-4-0-repls-for-lamdera-live-and-cli/10515 "2025-12-31T08:36:10Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![supermario](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.elm-lang.org/supermario/32/92_2.png) [@supermario](https://discourse.elm-lang.org/u/supermario)\
**Post date:** [December 31, 2025, 8:36am UTC](https://discourse.elm-lang.org/t/lamdera-v1-4-0-repls-for-lamdera-live-and-cli/10515/1 "2025-12-31T08:36:10Z")

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Hi all!

Lamdera v1.4.0 is now out, with new REPL functionality for lamdera live and CLI, as well as a few other other features and fixes.

Check out the release notes for the full details here:

[https://dashboard.lamdera.app/releases/v1-4-0](https://dashboard.lamdera.app/releases/v1-4-0)

Wishing everyone a happy new year and looking forward to more Elm things with you all in 2026! 🎆

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**Author:** ![jerith](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.elm-lang.org/jerith/32/114_2.png) [@jerith](https://discourse.elm-lang.org/u/jerith)\
**Post date:** [January 7, 2026, 5:50pm UTC](https://discourse.elm-lang.org/t/lamdera-v1-4-0-repls-for-lamdera-live-and-cli/10515/2 "2026-01-07T17:50:10Z")

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Very cool stuff, can’t wait to try it out!

Do `lamdera live`, `lamdera check`, `lamdera make` etc. also use the Elm-compiler-in-Elm, or are they still using the Haskell compiler?

I’m curious about the implications of this change for some of the statements on [https://dashboard.lamdera.app/docs/differences](https://dashboard.lamdera.app/docs/differences) (and pages linked from there) … will this make it harder for Lamdera to achieve compatibility with some future Elm 0.20 or 1.0 release?

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**Author:** ![pit](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.elm-lang.org/pit/32/5389_2.png) [@pit](https://discourse.elm-lang.org/u/pit)\
**Post date:** [January 8, 2026, 1:50am UTC](https://discourse.elm-lang.org/t/lamdera-v1-4-0-repls-for-lamdera-live-and-cli/10515/3 "2026-01-08T01:50:51Z")

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Hi Matt,

the Elm-Compiler-in-Elm port is just used for the `lamdera live` REPL. All the rest (including the new `lamdera backend` command) uses the Haskell compiler.

Of course, we are closely monitoring the upcoming 0.19.2 version and will try to incorporate the changes into Lamdera as soon as possible.

Happy testing 🙂

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**Author:** ![curtissimo](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.elm-lang.org/curtissimo/32/5544_2.png) [@curtissimo](https://discourse.elm-lang.org/u/curtissimo)\
**Post date:** [January 9, 2026, 3:32pm UTC](https://discourse.elm-lang.org/t/lamdera-v1-4-0-repls-for-lamdera-live-and-cli/10515/4 "2026-01-09T15:32:39Z")

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Oh, this is really neat! I’m going to try out Lamdera for the server-side backend in my current project.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex035/uploads/elm_lang/original/1X/50a05e53677a2c3b47776d7abd0f113eb50193a1.png) [@system](https://discourse.elm-lang.org/u/system)\
**Post date:** [January 19, 2026, 3:33pm UTC](https://discourse.elm-lang.org/t/lamdera-v1-4-0-repls-for-lamdera-live-and-cli/10515/5 "2026-01-19T15:33:34Z")

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