diff --git a/.gitignore b/.gitignore
index 420aac5..30a3b35 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 /public/css/app.css
 /storage/*.key
 /vendor
+composer.lock
 .env
 .env.backup
 .phpunit.result.cache
diff --git a/composer.json b/composer.json
index 0243f9c..3025b2a 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
     ],
     "license": "MIT",
     "require": {
-        "php": "^7.2.5|^8.0",
+        "php": "^7.4|^8.0",
         "fideloper/proxy": "^4.4",
         "guzzlehttp/guzzle": "^7.3",
         "laravel/framework": "^6.20",
@@ -37,10 +37,7 @@
         "psr-4": {
             "App\\": "app/"
         },
-        "classmap": [
-            "database/seeds",
-            "database/factories"
-        ]
+        "classmap": []
     },
     "autoload-dev": {
         "psr-4": {
diff --git a/sandd-core.nix b/sandd-core.nix
new file mode 100644
index 0000000..7ffbb23
--- /dev/null
+++ b/sandd-core.nix
@@ -0,0 +1,22 @@
+{ pkgs ? import <nixpkgs> {
+    inherit system;
+  }, system ? builtins.currentSystem
+}:
+let
+  name = "search-and-displace-core";
+  phpPackage = import ./default.nix {
+      inherit pkgs system;
+  };
+  nodePackage = import ./node.nix {
+      inherit pkgs system;
+  };
+in
+phpPackage.override {
+  buildInputs = [ pkgs.graphviz ];
+  removeComposerArtifacts = true; # Remove composer configuration files
+
+  # Add below all lines of post installation instructions e.g ''npm install'' ?
+  postInstall = ''
+    ll ./
+  '';
+}