diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 51d6c3d..a5715c9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,8 +18,8 @@ jobs:
         with:
           install_url: https://releases.nixos.org/nix/nix-2.13.3/install
           extra_nix_config: |
-            substituters = https://cache.nixos.org https://hydra.iohk.io https://cache.iog.io
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
+            substituters = https://cache.nixos.org https://cache.iog.io
+            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
             system-features = benchmark big-parallel kvm nixos-test
 
       - uses: cachix/cachix-action@v12