diff --git a/stable b/stable
index 67e9c88..a78c63a 160000
--- a/stable
+++ b/stable
@@ -1 +1 @@
-Subproject commit 67e9c880898889470f153157a96b595e758167fc
+Subproject commit a78c63a084314c55196488cf2252c5f6ea5c67a4
diff --git a/unstable b/unstable
index ba9f794..733994e 160000
--- a/unstable
+++ b/unstable
@@ -1 +1 @@
-Subproject commit ba9f7942037ac78a690eb7e2c15f4869c9515eb4
+Subproject commit 733994ea06585b76621073160e87b0bfac7fc5ae
diff --git a/update.sh b/update.sh
index 5c6cf07..b4a026c 100755
--- a/update.sh
+++ b/update.sh
@@ -28,7 +28,8 @@ function do_update () {
 git submodule update --remote
 
 # Update flake.lock to match
-nix flake update
+# Use nix build from https://github.com/NixOS/nix/pull/12107 to work around regression of https://github.com/NixOS/nix/issues/9708
+/nix/store/bn0djaymav6qa4zg5vaskzcaija5nq2p-nix-2.26.0pre20241227_9111645/bin/nix flake update
 
 # Test that everything still builds
 tests/machine-builds.sh