diff --git a/.github/workflows/colmena.yml b/.github/workflows/colmena.yml
index 4767e8c..2b07b55 100644
--- a/.github/workflows/colmena.yml
+++ b/.github/workflows/colmena.yml
@@ -38,6 +38,9 @@ jobs:
         with:
           extra_nix_config: |
             accept-flake-config = true
+            extra-substituters = https://nix-community.cachix.org
+            extra-trusted-public-keys = nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs=
+
 
       - name: Setup attic Binary Cache
         if: github.repository == 'tgstation-operations/infrastructure' && github.ref == 'refs/heads/main'