diff --git a/.github/workflows/nix-flake.yml b/.github/workflows/nix-flake.yml
index 99a80bc3..75433999 100644
--- a/.github/workflows/nix-flake.yml
+++ b/.github/workflows/nix-flake.yml
@@ -21,8 +21,8 @@ jobs:
     - uses: cachix/install-nix-action@V27
       with:
         extra_nix_config: |
-          trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hackage-server.cachix.org-1:iw0iRh6+gsFIrxROFaAt5gKNgIHejKjIfyRdbpPYevY=
-          substituters = https://hydra.iohk.io https://cache.nixos.org/ https://hackage-server.cachix.org/
+          trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hackage-server.cachix.org-1:iw0iRh6+gsFIrxROFaAt5gKNgIHejKjIfyRdbpPYevY=
+          substituters = https://cache.nixos.org/ https://hackage-server.cachix.org/
     - uses: cachix/cachix-action@v15
       with:
         # https://nix.dev/tutorials/continuous-integration-github-actions#setting-up-github-actions