diff --git a/ci-tools/update-nixpkgs b/ci-tools/update-nixpkgs
index 370184e720fd1c07f750bf34daf39bcaf5f854d9..246e185ad74d5dda4ee62b8a4fbed01d90e1042a 100755
--- a/ci-tools/update-nixpkgs
+++ b/ci-tools/update-nixpkgs
@@ -39,7 +39,7 @@ setup_git
 export TARGET_BRANCH="nixpkgs-upgrade-$(date +%Y-%m-%d)"
 
 echo '{}' > morph/grid/local/public-keys/users.nix
-# nix-build -A morph -o result-before
+nix-build -A morph -o result-before
 
 git branch -D "${TARGET_BRANCH}" || true
 git checkout -b "${TARGET_BRANCH}"
@@ -57,9 +57,8 @@ if git diff --exit-code origin/develop...; then
     exit 0
 fi
 
-# nix-build -A morph -o result-after
-# DIFF=$(nix --extra-experimental-features nix-command store diff-closures ./result-before/ ./result-after/)
-DIFF="Hello world"
+nix-build -A morph -o result-after
+DIFF=$(nix --extra-experimental-features nix-command store diff-closures ./result-before/ ./result-after/)
 
 git commit -am "bump nixpkgs version"
 git push --force origin "${TARGET_BRANCH}:${TARGET_BRANCH}"