diff --git a/.tangled/workflows/deploy.yaml b/.tangled/workflows/deploy.yaml
index 6fe32ce..9fe168b 100644
--- a/.tangled/workflows/deploy.yaml
+++ b/.tangled/workflows/deploy.yaml
@@ -5,16 +5,13 @@ when:
 dependencies:
   nixpkgs:
     - nix
-    - cargo
-    - rustc
-    - rustfmt
-    - clippy
-
 steps:
-  - name: "lint & fmt"
-    command: |
-      cargo clippy
-      cargo fmt --check
-  - name: test
-    command: |
-      cargo test
+  - name: build
+    command: nix build
+  #- name: "lint & fmt"
+  #  command: |
+  #    cargo clippy
+  #    cargo fmt --check
+  #- name: test
+  #  command: |
+  #    cargo test
diff --git a/flake.lock b/flake.lock
index 33048f6..5844885 100644
--- a/flake.lock
+++ b/flake.lock
@@ -21,6 +21,28 @@
         "type": "github"
       }
     },
+    "fenix_2": {
+      "inputs": {
+        "nixpkgs": [
+          "naersk",
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src_2"
+      },
+      "locked": {
+        "lastModified": 1752475459,
+        "narHash": "sha256-z6QEu4ZFuHiqdOPbYss4/Q8B0BFhacR8ts6jO/F/aOU=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "bf0d6f70f4c9a9cf8845f992105652173f4b617f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -39,6 +61,27 @@
         "type": "github"
       }
     },
+    "naersk": {
+      "inputs": {
+        "fenix": "fenix_2",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1752689277,
+        "narHash": "sha256-uldUBFkZe/E7qbvxa3mH1ItrWZyT6w1dBKJQF/3ZSsc=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "0e72363d0938b0208d6c646d10649164c43f4d64",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1751741127,
@@ -59,6 +102,7 @@
       "inputs": {
         "fenix": "fenix",
         "flake-utils": "flake-utils",
+        "naersk": "naersk",
         "nixpkgs": "nixpkgs"
       }
     },
@@ -79,6 +123,23 @@
         "type": "github"
       }
     },
+    "rust-analyzer-src_2": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1752428706,
+        "narHash": "sha256-EJcdxw3aXfP8Ex1Nm3s0awyH9egQvB2Gu+QEnJn2Sfg=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "591e3b7624be97e4443ea7b5542c191311aa141d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
     "systems": {
       "locked": {
         "lastModified": 1681028828,
diff --git a/flake.nix b/flake.nix
index 9bda942..3c4fdde 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,35 +6,53 @@
       url = "github:nix-community/fenix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    #naersk = {
-    #  url = "github:nix-community/naersk";
-    #  inputs.nixpkgs.follows = "nixpkgs";
-    #};
+    naersk = {
+      url = "github:nix-community/naersk";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, flake-utils, fenix, nixpkgs }:
+  outputs = { self, flake-utils, fenix, naersk, nixpkgs }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = (import nixpkgs) {
           inherit system;
         };
 
-        #toolchain = fenix.packages.${system}.stable;
+        toolchain = fenix.packages.${system}.stable.toolchain;
 
-        #naersk' = naersk.lib.${system}.override {
-        #  rustc = toolchain.rustc;
-        #  cargo = toolchain.cargo;
-        #};
+        naersk' = naersk.lib.${system}.override {
+          rustc = toolchain;
+          cargo = toolchain;
+        };
 
       in {
         # For `nix build` & `nix run`:
-        #defaultPackage = naersk'.buildPackage {
-        #  src = ./.;
-        #};
+        packages.default = naersk'.buildPackage {
+          src = ./.;
+        };
+
+        formatter = toolchain;
+
+        checks = {
+          build = self.packages.${system}.default;
+          #fmt = pkgs.runCommand "fmt-check" { buildInputs = [ toolchain ]; } ''
+          #  cargo fmt --check
+          #  touch $out
+          #'';
+          #clippy = pkgs.runCommand "clippy-check" { buildInputs = [ toolchain ]; } ''
+          #  cargo clippy
+          #  touch $out
+          #'';
+          #tests = pkgs.runCommand "tests" { buildInputs = [ toolchain ]; } ''
+          #  cargo test
+          #  touch $out
+          #'';
+        };
 
         # For `nix develop` (optional, can be skipped):
-        devShell = pkgs.mkShell {
-          nativeBuildInputs = [ fenix.packages.${system}.stable.toolchain ];
+        devShells.default = pkgs.mkShell {
+          buildInputs = [ toolchain ];
         };
       }
     );