diff --git a/configuration.nix b/configuration.nix
index 6f1bb71..7607f6c 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -68,7 +68,7 @@
 
   # Enable the KDE Plasma Desktop Environment.
   services.displayManager.sddm.enable = true;
-  services.desktopManager.plasma6.enable = true;
+  services.xserver.desktopManager.plasma5.enable = true;
 
   # fonts
   fonts.packages = with pkgs; [
@@ -144,7 +144,7 @@
       hostName = "talos";
       system = "x86_64-linux";
       protocol = "ssh-ng";
-      speedFactor = 4;
+      speedFactor = 3;
       supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
       mandatoryFeatures = [ ];
     }
@@ -152,7 +152,7 @@
       hostName = "january";
       system = "x86_64-linux";
       protocol = "ssh-ng";
-      speedFactor = 3;
+      speedFactor = 4;
       supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
       mandatoryFeatures = [ ];
     }