diff --git a/.github/workflows/eval.yaml b/.github/workflows/eval.yaml
index 90a9897..1997213 100644
--- a/.github/workflows/eval.yaml
+++ b/.github/workflows/eval.yaml
@@ -36,7 +36,7 @@ jobs:
           failed_hosts=""
           for host in $hosts; do
             echo "Eval derivation for $host"
-            if ! nix show-derivation -L ".#nixosConfigurations.$host.config.system.build.toplevel" > "eval/$host.json"; then
+            if ! nix derivation show ".#nixosConfigurations.$host.config.system.build.toplevel" > "eval/$host.json"; then
               echo "❌ Failed to evaluate $host"
               failed_hosts+="$host "
               rm "eval/$host.json"
diff --git a/modules/nixos/common-settings/comin.nix b/modules/nixos/common-settings/comin.nix
new file mode 100644
index 0000000..3d543f2
--- /dev/null
+++ b/modules/nixos/common-settings/comin.nix
@@ -0,0 +1,32 @@
+{
+  config,
+  lib,
+  ...
+}:
+let
+  inherit (lib)
+    mkEnableOption
+    mkIf
+    ;
+
+  cfg = config.commonSettings.comin;
+in
+{
+  options.commonSettings.comin = {
+    enable = mkEnableOption "auto updater with comin";
+  };
+
+  config = {
+    services.comin = mkIf cfg.enable {
+      enable = true;
+      remotes = [
+        {
+          name = "origin";
+          url = "https://github.com/xinyangli/nixos-config.git";
+          branches.main.name = "deploy-comin-eval";
+        }
+      ];
+      hostname = config.networking.hostName;
+    };
+  };
+}