diff --git a/infra/common/default.nix b/infra/common/default.nix
index 88e61d2..1cf40fe 100644
--- a/infra/common/default.nix
+++ b/infra/common/default.nix
@@ -7,4 +7,5 @@
 
   time.timeZone = "Europe/Amsterdam";
   i18n.defaultLocale = "en_US.UTF-8";
+  system.stateVersion = "24.05"; # do not change
 }
diff --git a/infra/vm02116/configuration.nix b/infra/vm02116/configuration.nix
index aa1432b..98d9548 100644
--- a/infra/vm02116/configuration.nix
+++ b/infra/vm02116/configuration.nix
@@ -35,22 +35,4 @@
   ## two options can safely be removed.
   boot.initrd.availableKernelModules = [ "xen_blkfront" ];
   services.xe-guest-utilities.enable = true;
-
-  # This option defines the first version of NixOS you have installed on this particular machine,
-  # and is used to maintain compatibility with application data (e.g. databases) created on older NixOS versions.
-  #
-  # Most users should NEVER change this value after the initial install, for any reason,
-  # even if you've upgraded your system to a new NixOS release.
-  #
-  # This value does NOT affect the Nixpkgs version your packages and OS are pulled from,
-  # so changing it will NOT upgrade your system.
-  #
-  # This value being lower than the current NixOS release does NOT mean your system is
-  # out of date, out of support, or vulnerable.
-  #
-  # Do NOT change this value unless you have manually inspected all the changes it would make to your configuration,
-  # and migrated your data accordingly.
-  #
-  # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
-  system.stateVersion = "24.05";
 }
diff --git a/infra/vm02179/configuration.nix b/infra/vm02179/configuration.nix
index 263b94c..7c8e32b 100644
--- a/infra/vm02179/configuration.nix
+++ b/infra/vm02179/configuration.nix
@@ -32,12 +32,4 @@
     })
     wget
   ];
-
-  # This value determines the NixOS release from which the default
-  # settings for stateful data, like file locations and database versions
-  # on your system were taken. It‘s perfectly fine and recommended to leave
-  # this value at the release version of the first install of this system.
-  # Before changing this value read the documentation for this option
-  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
-  system.stateVersion = "24.05"; # Did you read the comment?
 }
diff --git a/infra/vm02186/procolix-configuration.nix b/infra/vm02186/procolix-configuration.nix
index 96c9ac5..2919a0e 100644
--- a/infra/vm02186/procolix-configuration.nix
+++ b/infra/vm02186/procolix-configuration.nix
@@ -28,12 +28,4 @@
     })
     wget
   ];
-
-  # This value determines the NixOS release from which the default
-  # settings for stateful data, like file locations and database versions
-  # on your system were taken. It‘s perfectly fine and recommended to leave
-  # this value at the release version of the first install of this system.
-  # Before changing this value read the documentation for this option
-  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
-  system.stateVersion = "24.05"; # Did you read the comment?
 }
diff --git a/infra/vm02187/configuration.nix b/infra/vm02187/configuration.nix
index 6de5a01..7687ffb 100644
--- a/infra/vm02187/configuration.nix
+++ b/infra/vm02187/configuration.nix
@@ -90,13 +90,4 @@
     })
     wget
   ];
-
-  # This value determines the NixOS release from which the default
-  # settings for stateful data, like file locations and database versions
-  # on your system were taken. It‘s perfectly fine and recommended to leave
-  # this value at the release version of the first install of this system.
-  # Before changing this value read the documentation for this option
-  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
-  system.stateVersion = "24.05"; # Did you read the comment?
-
 }