diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6c7f23d..8028ed1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,6 +13,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v31
+        with:
+          extra_nix_config: |
+            extra-substituters = https://cache.nixos.org https://devenv.cachix.org https://nixpkgs-python.cachix.org
+            extra-trusted-public-keys = devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw= nixpkgs-python.cachix.org-1:hxjI7pFxTyuTHn2NkvWCrAUcNZLNS3ZAvfYNuYifcEU=
       - uses: cachix/cachix-action@v16
         with:
           name: planet-a-ventures
@@ -39,6 +43,10 @@ jobs:
         with:
           fetch-depth: 0
       - uses: cachix/install-nix-action@v31
+        with:
+          extra_nix_config: |
+            extra-substituters = https://cache.nixos.org https://devenv.cachix.org https://nixpkgs-python.cachix.org
+            extra-trusted-public-keys = devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw= nixpkgs-python.cachix.org-1:hxjI7pFxTyuTHn2NkvWCrAUcNZLNS3ZAvfYNuYifcEU=
       - uses: cachix/cachix-action@v16
         with:
           name: planet-a-ventures
diff --git a/devenv.nix b/devenv.nix
index 15a69a7..2e180df 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -7,8 +7,6 @@
 }:
 
 {
-  # https://devenv.sh/basics/
-  env.GREET = "devenv";
 
   # https://devenv.sh/packages/
   packages = [