diff --git a/.gitignore b/.gitignore
index 296d8b1c..5e9d423d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+.Trash-1000/
 result
 result/
 .direnv/
diff --git a/flake.lock b/flake.lock
index e2c237fa..1f054049 100644
--- a/flake.lock
+++ b/flake.lock
@@ -442,21 +442,6 @@
         "type": "github"
       }
     },
-    "impermanence": {
-      "locked": {
-        "lastModified": 1737831083,
-        "narHash": "sha256-LJggUHbpyeDvNagTUrdhe/pRVp4pnS6wVKALS782gRI=",
-        "owner": "nix-community",
-        "repo": "impermanence",
-        "rev": "4b3e914cdf97a5b536a889e939fb2fd2b043a170",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "impermanence",
-        "type": "github"
-      }
-    },
     "lanzaboote": {
       "inputs": {
         "crane": "crane",
@@ -910,7 +895,6 @@
         "ghostty": "ghostty",
         "haumea": "haumea",
         "home-manager": "home-manager_2",
-        "impermanence": "impermanence",
         "lanzaboote": "lanzaboote",
         "mysecrets": "mysecrets",
         "nix-darwin": "nix-darwin",
diff --git a/flake.nix b/flake.nix
index 5ad0ba3e..446aa417 100644
--- a/flake.nix
+++ b/flake.nix
@@ -66,7 +66,6 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
-    impermanence.url = "github:nix-community/impermanence";
     preservation.url = "github:nix-community/preservation";
 
     # community wayland nixpkgs
diff --git a/hosts/12kingdoms-shoukei/hardware-configuration.nix b/hosts/12kingdoms-shoukei/hardware-configuration.nix
index b92c3050..55ba80dc 100644
--- a/hosts/12kingdoms-shoukei/hardware-configuration.nix
+++ b/hosts/12kingdoms-shoukei/hardware-configuration.nix
@@ -90,7 +90,7 @@
     device = "/dev/disk/by-uuid/2f4db246-e65d-4808-8ab4-5365f9dea1ef";
     fsType = "btrfs";
     options = ["subvol=@persistent" "noatime" "compress-force=zstd:1"];
-    # impermanence's data is required for booting.
+    # preservation's data is required for booting.
     neededForBoot = true;
   };
 
diff --git a/hosts/idols-ai/hardware-configuration.nix b/hosts/idols-ai/hardware-configuration.nix
index 3a2abd5e..76bb715a 100644
--- a/hosts/idols-ai/hardware-configuration.nix
+++ b/hosts/idols-ai/hardware-configuration.nix
@@ -96,7 +96,7 @@
     device = "/dev/disk/by-uuid/1167076c-dee1-486c-83c1-4b1af37555cd";
     fsType = "btrfs";
     options = ["subvol=@persistent" "compress-force=zstd:1"];
-    # impermanence's data is required for booting.
+    # preservation's data is required for booting.
     neededForBoot = true;
   };
 
diff --git a/hosts/idols-ai/preservation.nix b/hosts/idols-ai/preservation.nix
index f7e0a881..6303e119 100644
--- a/hosts/idols-ai/preservation.nix
+++ b/hosts/idols-ai/preservation.nix
@@ -31,7 +31,7 @@ in {
   #
   #  See also https://grahamc.com/blog/erase-your-darlings/
 
-  # NOTE: impermanence only mounts the directory/file list below to /persistent
+  # NOTE: preservation only mounts the directory/file list below to /persistent
   # If the directory/file already exists in the root filesystem you should
   # move those files/directories to /persistent first!
   preservation.preserveAt."/persistent" = {
diff --git a/hosts/k8s/disko-config/README.md b/hosts/k8s/disko-config/README.md
index 227cf231..94f26db6 100644
--- a/hosts/k8s/disko-config/README.md
+++ b/hosts/k8s/disko-config/README.md
@@ -60,7 +60,7 @@ nixos-enter
 # NOTE: DO NOT skip this step!!!
 # copy the essential files into /persistent
 # otherwise the / will be cleared and data will lost
-## NOTE: impermanence just create links from / to /persistent
+## NOTE: preservation just create links from / to /persistent
 ##       We need to copy files into /persistent manually!!!
 mv /etc/machine-id /persistent/etc/
 mv /etc/ssh /persistent/etc/
diff --git a/hosts/k8s/disko-config/kubevirt-disko-fs.nix b/hosts/k8s/disko-config/kubevirt-disko-fs.nix
index 24c7d5b3..2e81880f 100644
--- a/hosts/k8s/disko-config/kubevirt-disko-fs.nix
+++ b/hosts/k8s/disko-config/kubevirt-disko-fs.nix
@@ -1,5 +1,5 @@
 {
-  # required by impermanence
+  # required by preservation
   fileSystems."/persistent".neededForBoot = true;
 
   # contains the k3s's token
diff --git a/nixos-installer/.gitignore b/nixos-installer/.gitignore
new file mode 100644
index 00000000..ef03e874
--- /dev/null
+++ b/nixos-installer/.gitignore
@@ -0,0 +1,2 @@
+# generate lock file every time
+flake.lock
diff --git a/nixos-installer/README.md b/nixos-installer/README.md
index adda27ee..62f35647 100644
--- a/nixos-installer/README.md
+++ b/nixos-installer/README.md
@@ -23,7 +23,7 @@ The configuration of the main flake, [/flake.nix](/flake.nix), is heavy, and it
 
 1. Adjust & verify my `hardware-configuration.nix` modification quickly before deploying the main
    flake.
-2. Test some new filesystem related features on a NixOS virtual machine, such as impermanence,
+2. Test some new filesystem related features on a NixOS virtual machine, such as preservation,
    Secure Boot, TPM2, Encryption, etc.
 
 ## Steps to Deploying this flake
@@ -221,7 +221,7 @@ nixos-enter
 # NOTE: DO NOT skip this step!!!
 # copy the essential files into /persistent
 # otherwise the / will be cleared and data will lost
-## NOTE: impermanence just create links from / to /persistent
+## NOTE: preservation just create links from / to /persistent
 ##       We need to copy files into /persistent manually!!!
 mv /etc/machine-id /persistent/etc/
 mv /etc/ssh /persistent/etc/
diff --git a/nixos-installer/README.shoukei.md b/nixos-installer/README.shoukei.md
index c3586913..4d003e7b 100755
--- a/nixos-installer/README.shoukei.md
+++ b/nixos-installer/README.shoukei.md
@@ -200,7 +200,7 @@ nixos-enter
 # NOTE: DO NOT skip this step!!!
 # copy the essential files into /persistent
 # otherwise the / will be cleared and data will lost
-## NOTE: impermanence just create links from / to /persistent
+## NOTE: preservation just create links from / to /persistent
 ##       We need to copy files into /persistent manually!!!
 mv /etc/machine-id /persistent/etc/
 mv /etc/ssh /persistent/etc/
diff --git a/nixos-installer/flake.lock b/nixos-installer/flake.lock
deleted file mode 100644
index 6d6f6876..00000000
--- a/nixos-installer/flake.lock
+++ /dev/null
@@ -1,58 +0,0 @@
-{
-  "nodes": {
-    "impermanence": {
-      "locked": {
-        "lastModified": 1702984171,
-        "narHash": "sha256-reIUBrUXibohXmvXRsgpvtlCE0QQSvWSA+qQCKohgR0=",
-        "owner": "nix-community",
-        "repo": "impermanence",
-        "rev": "123e94200f63952639492796b8878e588a4a2851",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "impermanence",
-        "type": "github"
-      }
-    },
-    "nixos-hardware": {
-      "locked": {
-        "lastModified": 1702453208,
-        "narHash": "sha256-0wRi9SposfE2wHqjuKt8WO2izKB/ASDOV91URunIqgo=",
-        "owner": "NixOS",
-        "repo": "nixos-hardware",
-        "rev": "7763c6fd1f299cb9361ff2abf755ed9619ef01d6",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixos-hardware",
-        "type": "indirect"
-      }
-    },
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1703068421,
-        "narHash": "sha256-WSw5Faqlw75McIflnl5v7qVD/B3S2sLh+968bpOGrWA=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "d65bceaee0fb1e64363f7871bc43dc1c6ecad99f",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nixos",
-        "ref": "nixos-25.05",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "impermanence": "impermanence",
-        "nixos-hardware": "nixos-hardware",
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
diff --git a/nixos-installer/flake.nix b/nixos-installer/flake.nix
index 30c57480..53d470fd 100644
--- a/nixos-installer/flake.nix
+++ b/nixos-installer/flake.nix
@@ -3,7 +3,7 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
-    impermanence.url = "github:nix-community/impermanence";
+    preservation.url = "github:nix-community/preservation";
     nixos-hardware.url = "github:NixOS/nixos-hardware/master";
     nuenv.url = "github:DeterminateSystems/nuenv";
   };
diff --git a/secrets/nixos.nix b/secrets/nixos.nix
index 46694e29..768e6a48 100644
--- a/secrets/nixos.nix
+++ b/secrets/nixos.nix
@@ -45,7 +45,7 @@ in {
     server.webserver.enable = mkEnableOption "NixOS Secrets for Web Servers(contains tls cert keys)";
     server.storage.enable = mkEnableOption "NixOS Secrets for HDD Data's LUKS Encryption";
 
-    preservation.enable = mkEnableOption "whether use impermanence and ephemeral root file system";
+    preservation.enable = mkEnableOption "whether use preservation and ephemeral root file system";
   };
 
   config = mkIf (cfg.desktop.enable || enabledServerSecrets) (mkMerge [
@@ -59,7 +59,7 @@ in {
         if cfg.preservation.enable
         then [
           # To decrypt secrets on boot, this key should exists when the system is booting,
-          # so we should use the real key file path(prefixed by `/persistent/`) here, instead of the path mounted by impermanence.
+          # so we should use the real key file path(prefixed by `/persistent/`) here, instead of the path mounted by preservation.
           "/persistent/etc/ssh/ssh_host_ed25519_key" # Linux
         ]
         else [