diff --git a/flake.nix b/flake.nix
--- a/flake.nix
+++ b/flake.nix
@@ -39,7 +39,7 @@
     # Add comm binary cache to avoid our pinned packages from needing
     # to be built by any consumer
     nixConfig = {
-      extra-substituters = [ "https://comm.cachix.org" ];
+      extra-trusted-substituters = [ "https://comm.cachix.org" ];
       extra-trusted-public-keys = [
         "comm.cachix.org-1:70RF31rkmCEhQ9HrXA2uXcpqQKGcUK3TxLJdgcUCaA4="
       ];