diff --git a/machines/lisa/hardware.nix b/machines/lisa/hardware.nix
index cdd8eb2..72994e1 100644
--- a/machines/lisa/hardware.nix
+++ b/machines/lisa/hardware.nix
@@ -1,7 +1,7 @@
 { pkgs, config, lib, ... }:
 {
   boot.initrd.availableKernelModules = [ "ata_piix" "uhci_hcd" "virtio_pci" "sd_mod" "sr_mod" ];
-  boot.kernelPackages = pkgs.linuxPackages_5_18;
+  boot.kernelPackages = pkgs.linuxPackages_5_15;
 
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ ];
diff --git a/machines/newton/hardware.nix b/machines/newton/hardware.nix
index ddae6a8..61c0578 100644
--- a/machines/newton/hardware.nix
+++ b/machines/newton/hardware.nix
@@ -6,7 +6,7 @@
   boot.zfs.requestEncryptionCredentials = true;
   boot.loader.grub.copyKernels = true;
   boot.loader.grub.efiSupport = false;
-  boot.kernelPackages = pkgs.linuxPackages_5_18;
+  boot.kernelPackages = pkgs.linuxPackages_5_15;
 
   boot.loader.grub.mirroredBoots = [
     { path = "/boot-1"; devices = [ "/dev/disk/by-id/ata-WDC_WD20EFRX-68EUZN0_WD-WCC4M1TVUVJV" ]; }