diff --git a/ci-tools/update-nixpkgs b/ci-tools/update-nixpkgs
index 78f257db7031cda7c76e6dd4e36957a4f58725c0..07b00a41a45d61c14e49dae02a9d5772ce5482e2 100755
--- a/ci-tools/update-nixpkgs
+++ b/ci-tools/update-nixpkgs
@@ -6,6 +6,7 @@ set -eux -o pipefail
 TARGET_BRANCH="nixpkgs-upgrade-$(date +%Y-%m-%d)"
 git checkout -b "${TARGET_BRANCH}"
 
+echo '{}' > morph/grid/local/public-keys/users.nix
 nix-build -A morph -o result-before
 update-nixpkgs
 nix-build -A morph -o result-after