diff --git a/hosts/PubSolarOS.nix b/hosts/PubSolarOS.nix
index 70cf7a08..d741a4d1 100644
--- a/hosts/PubSolarOS.nix
+++ b/hosts/PubSolarOS.nix
@@ -12,4 +12,12 @@
   networking.networkmanager.enable = true;
 
   fileSystems."/" = { device = "/dev/disk/by-label/nixos"; };
+
+  # 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 = "22.05"; # Did you read the comment?
 }
diff --git a/hosts/bootstrap.nix b/hosts/bootstrap.nix
index c6d8f105..acadc449 100644
--- a/hosts/bootstrap.nix
+++ b/hosts/bootstrap.nix
@@ -18,4 +18,12 @@
 
   # will be overridden by the bootstrapIso instrumentation
   fileSystems."/" = { device = "/dev/disk/by-label/nixos"; };
+
+  # 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 = "21.05"; # Did you read the comment?
 }
diff --git a/hosts/fae.nix b/hosts/fae.nix
index fac810d0..10a4237f 100644
--- a/hosts/fae.nix
+++ b/hosts/fae.nix
@@ -81,5 +81,13 @@
 
     # custom raspi boot loader is already present
     boot.loader.systemd-boot.enable = lib.mkForce false;
+
+    # 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 = "21.05"; # Did you read the comment?
   };
 }
diff --git a/hosts/ryzensun/ryzensun.nix b/hosts/ryzensun/ryzensun.nix
index ccf9f52e..295b0810 100644
--- a/hosts/ryzensun/ryzensun.nix
+++ b/hosts/ryzensun/ryzensun.nix
@@ -26,5 +26,13 @@ in
       "sway/config.d/input-defaults.conf".source = ./.config/sway/config.d/input-defaults.conf;
       "sway/config.d/screens.conf".source = ./.config/sway/config.d/screens.conf;
     };
+
+    # 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 = "21.05"; # Did you read the comment?
   };
 }