diff --git a/.github/workflows/flake-update.yml b/.github/workflows/flake-update.yml
index 535bcac..4c26304 100644
--- a/.github/workflows/flake-update.yml
+++ b/.github/workflows/flake-update.yml
@@ -18,8 +18,7 @@ jobs:
         uses: cachix/install-nix-action@v24
         with:
           extra_nix_config: |
-            experimental-features = nix-command flakes
-          install_url: https://releases.nixos.org/nix/nix-2.19.0/install
+            experimental-features = nix-command flakes auto-allocate-uids configurable-impure-env
       - name: Calculate pre-drv
         run: nix run git+https://nayeonie.com/ahuston-0/flake-update-diff -- --build .
       # - name: Pull latest docker images
diff --git a/utils/diff-evals.sh b/utils/diff-evals.sh
index 950699d..93ddc8a 100755
--- a/utils/diff-evals.sh
+++ b/utils/diff-evals.sh
@@ -10,4 +10,4 @@ set -e
 script_path=$(dirname "$(readlink -f $0)")
 parent_path=$(dirname "$script_path")
 
-nix run git+https://nayeonie.com/ahuston-0/flake-update-diff -- --compare-drvs "$parent_path"
+nix run git+https://nayeonie.com/ahuston-0/flake-update-diff -- --compare-drvs --compare-output-to-file "$parent_path"