diff --git a/nixos/linux.nix b/nixos/linux.nix
index 758b57c..b3d0ba0 100644
--- a/nixos/linux.nix
+++ b/nixos/linux.nix
@@ -161,7 +161,7 @@ in {
 
       "ubuntu" = {
         autoStart = true;
-        image = "quineglobal/ubuntu-with-ssh:687d50f2f6a6";
+        image = "quineglobal/ubuntu-with-ssh@sha256:7fb6326b9958828ed1de2165345e0908affd0af66e4b35d22cca9c549f2823fd";
         volumes = [ ];
         environment = {};
         ports = ["222:22"];