diff --git a/ci-tools/update-nixpkgs b/ci-tools/update-nixpkgs
index 3f1c573c025c8faa9952755849d3388107f34ac0..ee452e30e1bfce7d5dee5a486f8d9704f45e0fbe 100755
--- a/ci-tools/update-nixpkgs
+++ b/ci-tools/update-nixpkgs
@@ -42,7 +42,7 @@ git checkout "${TARGET_BRANCH}" || git checkout -b "${TARGET_BRANCH}"
 
 # Spawn *another* nix-shell that has the *other* update-nixpkgs tool.  Should
 # sort out this mess sooner rather than later...
-nix-shell ./shell.nix --run 'update-nixpkgs --dry-run'
+nix-shell ./shell.nix --run 'update-nixpkgs'
 
 git fetch origin develop
 git branch -a