diff --git a/flake.lock b/flake.lock
index 7ce1fbb..5498109 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,97 +1,12 @@
 {
   "nodes": {
-    "devshell": {
-      "inputs": {
-        "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
-      },
-      "locked": {
-        "lastModified": 1682700442,
-        "narHash": "sha256-qjaAAcCYgp1pBBG7mY9z95ODUBZMtUpf0Qp3Gt/Wha0=",
-        "owner": "numtide",
-        "repo": "devshell",
-        "rev": "fb6673fe9fe4409e3f43ca86968261e970918a83",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "devshell",
-        "type": "github"
-      }
-    },
-    "flake-parts": {
-      "inputs": {
-        "nixpkgs-lib": "nixpkgs-lib"
-      },
-      "locked": {
-        "lastModified": 1682984683,
-        "narHash": "sha256-fSMthG+tp60AHhNmaHc4StT3ltfHkQsJtN8GhfLWmtI=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "86684881e184f41aa322e653880e497b66429f3e",
-        "type": "github"
-      },
-      "original": {
-        "id": "flake-parts",
-        "type": "indirect"
-      }
-    },
-    "flake-utils": {
-      "locked": {
-        "lastModified": 1642700792,
-        "narHash": "sha256-XqHrk7hFb+zBvRg6Ghl+AZDq03ov6OshJLiSWOoX5es=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "846b2ae0fc4cc943637d3d1def4454213e203cba",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1677383253,
-        "narHash": "sha256-UfpzWfSxkfXHnb4boXZNaKsAcUrZT9Hw+tao1oZxd08=",
+        "lastModified": 1713537308,
+        "narHash": "sha256-XtTSSIB2DA6tOv+l0FhvfDMiyCmhoRbNB+0SeInZkbk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9952d6bc395f5841262b006fbace8dd7e143b634",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs-lib": {
-      "locked": {
-        "dir": "lib",
-        "lastModified": 1682879489,
-        "narHash": "sha256-sASwo8gBt7JDnOOstnps90K1wxmVfyhsTPPNTGBPjjg=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "da45bf6ec7bbcc5d1e14d3795c025199f28e0de0",
-        "type": "github"
-      },
-      "original": {
-        "dir": "lib",
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1705856552,
-        "narHash": "sha256-JXfnuEf5Yd6bhMs/uvM67/joxYKoysyE3M2k6T3eWbg=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "612f97239e2cc474c13c9dafa0df378058c5ad8d",
+        "rev": "5c24cf2f0a12ad855f444c30b2421d044120c66f",
         "type": "github"
       },
       "original": {
@@ -103,9 +18,7 @@
     },
     "root": {
       "inputs": {
-        "devshell": "devshell",
-        "flake-parts": "flake-parts",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index 740f3a0..5d5df7b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,24 +1,23 @@
 {
-  inputs.devshell.url = "github:numtide/devshell";
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
 
-  outputs = inputs@{ flake-parts, ... }:
-    flake-parts.lib.mkFlake { inherit inputs; } {
-      imports = [ inputs.devshell.flakeModule ];
+  outputs = { nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
 
-      systems = [ "x86_64-linux" ];
-
-      perSystem = { config, self', inputs', pkgs, system, ... }: {
-        formatter = pkgs.nixpkgs-fmt;
-
-        devshells.default = {
-          packages = with pkgs; [
-            ghostscript
-            pdfpc
-            python310Packages.rst2pdf
-            tree
-          ];
-        };
+      inherit (pkgs) mkShell nixfmt-classic;
+    in {
+      devShells.${system}.default = mkShell {
+        packages = with pkgs; [
+          ghostscript
+          just
+          pdfpc
+          python310Packages.rst2pdf
+          tree
+        ];
       };
+
+      formatter.${system} = nixfmt-classic;
     };
 }