diff --git a/flake.lock b/flake.lock
index 779816d84e0..0cc50c5f340 100644
--- a/flake.lock
+++ b/flake.lock
@@ -15,6 +15,22 @@
         "type": "github"
       }
     },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1761588595,
+        "narHash": "sha256-XKUZz9zewJNUj46b4AJdiRZJAvSZ0Dqj2BNfXvFlJC4=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "f387cd2afec9419c8ee37694406ca490c3f34ee5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -115,11 +131,36 @@
         "type": "github"
       }
     },
+    "phps": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "utils": [
+          "flake-utils"
+        ]
+      },
+      "locked": {
+        "lastModified": 1763965909,
+        "narHash": "sha256-Hx/ZHl8Tc8C6gP2xN0zAl7txk1sUZA98NrflyJuw+70=",
+        "owner": "fossar",
+        "repo": "nix-phps",
+        "rev": "8b3b0250e31d56283a8fa1b66dbd78fb21fa4893",
+        "type": "github"
+      },
+      "original": {
+        "owner": "fossar",
+        "repo": "nix-phps",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "flake-utils": "flake-utils",
         "haze": "haze",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "phps": "phps"
       }
     },
     "rust-overlay": {
diff --git a/flake.nix b/flake.nix
index a131280d1d5..b947815af2c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,14 +1,26 @@
 {
+  nixConfig = {
+    extra-substituters = [ "https://fossar.cachix.org" ];
+    extra-trusted-public-keys = [ "fossar.cachix.org-1:Zv6FuqIboeHPWQS7ysLCJ7UT7xExb4OE8c4LyGb5AsE=" ];
+  };
+
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
     flake-utils.url = "github:numtide/flake-utils";
+	phps = {
+	  url = "github:fossar/nix-phps";
+	  inputs = {
+	    nixpkgs.follows = "nixpkgs";
+	    utils.follows = "flake-utils";
+	  };
+	};
     haze = {
       url = "git+https://codeberg.org/icewind/haze.git";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
 
-  outputs = { nixpkgs, flake-utils, haze, ... }:
+  outputs = { nixpkgs, flake-utils, phps, haze, ... }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
@@ -18,7 +30,7 @@
         devShells.default =
           let
             php_version = lib.strings.concatStrings (builtins.match ".*PHP_VERSION_ID < ([0-9])0([0-9])00.*" (builtins.readFile ./lib/versioncheck.php));
-            php = pkgs.pkgs."php${php_version}".buildEnv {
+            php = phps.packages.${system}."php${php_version}".buildEnv {
               # Based off https://docs.nextcloud.com/server/latest/admin_manual/installation/php_configuration.html
               extensions = ({ enabled, all }: enabled ++ (with all; [
                 # Required