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At the moment (Oct 24th, 2014) cabal 1.18 ships with Stackage, while cabal 1.20 is out since April 2014. I expect there is a reason for this: I'm curious to what that reason may be and hope that by this question I can get it out on a place that Google indexes.

cies
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    Have you sent an email to to the Stackage maintainers? – Zeta Oct 24 '14 at 09:26
  • @Zeta, nope I have not. I know the Michael and others are on top of this site, and otherwise I had to mail them and write a blog post on it in order to have Google index it (and my blog will probably rank worse then this site). – cies Oct 24 '14 at 12:12

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Because the ghc package- which cannot be upgraded- depends on Cabal-1.18. For more information, see https://www.fpcomplete.com/blog/2014/05/lenient-lower-bounds. For the same reason, Haskell Platform ships with Cabal 1.18, and GHC 7.10 is trying to get rid of the Cabal dependency in the ghc package (and, AFAIK, that's already landed in HEAD).

Michael Snoyman
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  • Thanks Michael, once again. Now Google, c'mon and index this! :) – cies Oct 24 '14 at 12:10
  • [Reference in a Reddit thread on the GHC-Cabal-HaskellPlatform version lock](http://www.reddit.com/r/haskell/comments/2d3p2c/haskell_platform_2014200_is_released/cjm4xtp) – cies Oct 24 '14 at 12:18