diff --git a/overlays/10-previews.nix b/overlays/10-previews.nix
index b6a6f709..fe04fa47 100644
--- a/overlays/10-previews.nix
+++ b/overlays/10-previews.nix
@@ -6,6 +6,6 @@ in {
   inherit unstable;
   unstableHaskellPackages = unstable.haskellPackages;
   unstableGhc = unstable.ghc;
-  inherit (unstable) nix home-assistant vscode-extensions vscodium mumble cachix cabal2nix alejandra;
+  inherit (unstable) nix home-assistant vscode-extensions vscodium cachix cabal2nix;
   nix-output-monitor = nom.packages.x86_64-linux.default;
 }
diff --git a/shell.nix b/shell.nix
index 84258b4d..88a510ea 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,4 +1,4 @@
-(import (import ./nix/sources.nix).nixos-unstable {}).mkShell {
+(import (import ./nix/sources.nix).nixos-stable {}).mkShell {
   shellHook = ''
     ${(import ./test.nix).pre-commit-check.shellHook}
   '';
diff --git a/test.nix b/test.nix
index af6c3afe..407fe35b 100644
--- a/test.nix
+++ b/test.nix
@@ -1,5 +1,6 @@
 let
-  nix-pre-commit-hooks = import (import ./nix/sources.nix)."pre-commit-hooks.nix";
+  sources = import ./nix/sources.nix;
+  nix-pre-commit-hooks = import "${sources."pre-commit-hooks.nix"}/nix" {nixpkgs = sources.nixos-stable;};
 in {
   pre-commit-check = nix-pre-commit-hooks.run {
     src = ./.;