diff --git a/.envrc b/.envrc
index 1d953f4..3550a30 100644
--- a/.envrc
+++ b/.envrc
@@ -1 +1 @@
-use nix
+use flake
diff --git a/flake.lock b/flake.lock
index 0f7109b..4583957 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1730327045,
-        "narHash": "sha256-xKel5kd1AbExymxoIfQ7pgcX6hjw9jCgbiBjiUfSVJ8=",
+        "lastModified": 1731797254,
+        "narHash": "sha256-df3dJApLPhd11AlueuoN0Q4fHo/hagP75LlM5K1sz9g=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "080166c15633801df010977d9d7474b4a6c549d7",
+        "rev": "e8c38b73aeb218e27163376a2d617e61a2ad9b59",
         "type": "github"
       },
       "original": {
diff --git a/tanks-backend/TanksServer/GameLogic/MapService.cs b/tanks-backend/TanksServer/GameLogic/MapService.cs
index 56be4ec..a79bd94 100644
--- a/tanks-backend/TanksServer/GameLogic/MapService.cs
+++ b/tanks-backend/TanksServer/GameLogic/MapService.cs
@@ -7,11 +7,11 @@ namespace TanksServer.GameLogic;
 
 internal sealed class MapService
 {
-    public const ulong TilesPerRow = 44;
-    public const ulong TilesPerColumn = 20;
-    public const ulong TileSize = 8;
-    public const ulong PixelsPerRow = TilesPerRow * TileSize;
-    public const ulong PixelsPerColumn = TilesPerColumn * TileSize;
+    public static readonly ulong TilesPerRow = 44;
+    public static readonly ulong TilesPerColumn = ServicePointConstants.TileHeight;
+    public static readonly ulong TileSize = ServicePointConstants.TileSize;
+    public static readonly ulong PixelsPerRow = TilesPerRow * TileSize;
+    public static readonly ulong PixelsPerColumn = TilesPerColumn * TileSize;
 
     private readonly ConcurrentDictionary<string, MapPrototype> _mapPrototypes = new();
     private readonly ConcurrentDictionary<string, Bitmap> _mapPreviews = new();
diff --git a/tanks-backend/servicepoint b/tanks-backend/servicepoint
index 2345108..93657c9 160000
--- a/tanks-backend/servicepoint
+++ b/tanks-backend/servicepoint
@@ -1 +1 @@
-Subproject commit 234510842d6676b8e8a7cbabbe8d3373aa8d3e6e
+Subproject commit 93657c9f85d021c04270e1f5af573a6cda51f18a