5 files changed, 8 insertions, 1 deletions
diff --git a/nixos/modules/installer/cd-dvd/installation-cd-base.nix b/nixos/modules/installer/cd-dvd/installation-cd-base.nix
index 756c8751d00e..1ed56386e6e7 100644
--- a/nixos/modules/installer/cd-dvd/installation-cd-base.nix
+++ b/nixos/modules/installer/cd-dvd/installation-cd-base.nix
@@ -31,4 +31,6 @@ with lib;
 
   # Allow the user to log in as root without a password.
   users.extraUsers.root.initialHashedPassword = "";
+
+  system.nixos.stateVersion = mkDefault "18.03";
 }
diff --git a/nixos/modules/installer/virtualbox-demo.nix b/nixos/modules/installer/virtualbox-demo.nix
index 13a0d7f4f6ee..c40e30354206 100644
--- a/nixos/modules/installer/virtualbox-demo.nix
+++ b/nixos/modules/installer/virtualbox-demo.nix
@@ -21,4 +21,5 @@ with lib;
   services.xserver.videoDrivers = mkOverride 40 [ "virtualbox" "vmware" "cirrus" "vesa" "modesetting" ];
 
   powerManagement.enable = false;
+  system.nixos.stateVersion = mkDefault "18.03";
 }
diff --git a/nixos/release.nix b/nixos/release.nix
index 57fc245e57dd..7ec41af4fd4b 100644
--- a/nixos/release.nix
+++ b/nixos/release.nix
@@ -198,6 +198,7 @@ in rec {
         modules = singleton ({ config, pkgs, ... }:
           { fileSystems."/".device  = mkDefault "/dev/sda1";
             boot.loader.grub.device = mkDefault "/dev/sda";
+            system.nixos.stateVersion = mkDefault "18.03";
           });
       }).config.system.build.toplevel;
       preferLocalBuild = true;
diff --git a/nixos/tests/containers-imperative.nix b/nixos/tests/containers-imperative.nix
index 015b79b1cee6..a548b17b1ff1 100644
--- a/nixos/tests/containers-imperative.nix
+++ b/nixos/tests/containers-imperative.nix
@@ -17,7 +17,9 @@ import ./make-test.nix ({ pkgs, ...} : {
         emptyContainer = import ../lib/eval-config.nix {
           inherit (config.nixpkgs.localSystem) system;
           modules = lib.singleton {
-            containers.foo.config = {};
+            containers.foo.config = {
+              system.nixos.stateVersion = "18.03";
+            };
           };
         };
       in [ pkgs.stdenv emptyContainer.config.containers.foo.path pkgs.libxslt ];
diff --git a/nixos/tests/containers-ipv4.nix b/nixos/tests/containers-ipv4.nix
index 31d05990a679..821ce1cd07d2 100644
--- a/nixos/tests/containers-ipv4.nix
+++ b/nixos/tests/containers-ipv4.nix
@@ -21,6 +21,7 @@ import ./make-test.nix ({ pkgs, ...} : {
               services.httpd.adminAddr = "foo@example.org";
               networking.firewall.allowedTCPPorts = [ 80 ];
               networking.firewall.allowPing = true;
+              system.nixos.stateVersion = "18.03";
             };
         };