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diff --git a/doc/preface.chapter.md b/doc/preface.chapter.md
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@@ -37,12 +37,12 @@ security updates. More up to date packages and modules are available via the
 
 Both `nixos-unstable` and `nixpkgs` follow the `master` branch of the Nixpkgs
 repository, although both do lag the `master` branch by generally
-[a couple of days](https://howoldis.herokuapp.com/). Updates to a channel are
+[a couple of days](https://status.nixos.org/). Updates to a channel are
 distributed as soon as all tests for that channel pass, e.g.
 [this table](https://hydra.nixos.org/job/nixpkgs/trunk/unstable#tabs-constituents)
 shows the status of tests for the `nixpkgs` channel.
 
-The tests are conducted by a cluster called [Hydra](http://nixos.org/hydra/),
+The tests are conducted by a cluster called [Hydra](https://nixos.org/hydra/),
 which also builds binary packages from the Nix expressions in Nixpkgs for
 `x86_64-linux`, `i686-linux` and `x86_64-darwin`.
 The binaries are made available via a [binary cache](https://cache.nixos.org).