diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 79d4928..cbe6172 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -21,7 +21,7 @@ For development, [cabal](https://cabal.readthedocs.io/en/latest/) should work _o
 Alternatively, you can spin up a nix shell as follow:
 
 ```
-nix develop github:CardanoSolutions/devx#ghc96-iog-full --no-write-lock-file --refresh
+nix develop github:CardanoSolutions/devx#ghc94-iog-full --no-write-lock-file --refresh
 ```
 
 If using the Nix shell, you'll likely want to create a `cabal.project.local` file:
diff --git a/docs/api/nightly.yaml b/docs/api/nightly.yaml
index d51b5ee..f663e56 100644
--- a/docs/api/nightly.yaml
+++ b/docs/api/nightly.yaml
@@ -81,8 +81,8 @@ info:
     Make sure to have [nix](https://nixos.org/download.html#nix-install-linux) installed with a cache:
 
     ```
-    trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= loony-tools:pr9m4BkM/5/eSTZlkQyRt57Jz7OMBxNSUiMC4FkcNfk=
-    substituters = https://cache.zw3rk.com/ https://cache.nixos.org/
+    trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
+    substituters = https://cache.iog.io/ https://cache.nixos.org/
     ```
 
     On MacOS, you'll need to install `libffi` and `bzip2` if they aren't already installed.