diff --git a/package-lock.json b/package-lock.json
index cbcc19bdf9..32126ed830 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,13 +1,35 @@
 {
   "name": "stendhal",
   "version": "1.0.0",
-  "lockfileVersion": 1,
+  "lockfileVersion": 2,
   "requires": true,
+  "packages": {
+    "": {
+      "name": "stendhal",
+      "version": "1.0.0",
+      "license": "AGPL-3.0-or-later",
+      "dependencies": {
+        "typescript": "^5.1.0"
+      }
+    },
+    "node_modules/typescript": {
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.2.2.tgz",
+      "integrity": "sha512-mI4WrpHsbCIcwT9cF4FZvr80QUeKvsUsUvKDoR+X/7XHQH98xYD8YHZg7ANtz2GtZt/CBq2QJ0thkGJMHfqc1w==",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    }
+  },
   "dependencies": {
     "typescript": {
-      "version": "4.5.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.5.3.tgz",
-      "integrity": "sha512-eVYaEHALSt+s9LbvgEv4Ef+Tdq7hBiIZgii12xXJnukryt3pMgJf6aKhoCZ3FWQsu6sydEnkg11fYXLzhLBjeQ=="
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.2.2.tgz",
+      "integrity": "sha512-mI4WrpHsbCIcwT9cF4FZvr80QUeKvsUsUvKDoR+X/7XHQH98xYD8YHZg7ANtz2GtZt/CBq2QJ0thkGJMHfqc1w=="
     }
   }
 }
diff --git a/package.json b/package.json
index cd34a72ff2..1dec9efce7 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,6 @@
   "homepage": "https://arianne-project.org",
   "private": true,
   "dependencies": {
-    "typescript": "^4.5.3"
+    "typescript": "^5.2.0"
   }
 }
diff --git a/srcjs/stendhal/data/ImageWithDimensions.ts b/srcjs/stendhal/data/ImageWithDimensions.ts
new file mode 100644
index 0000000000..3305bf6de8
--- /dev/null
+++ b/srcjs/stendhal/data/ImageWithDimensions.ts
@@ -0,0 +1,15 @@
+/***************************************************************************
+ *                   (C) Copyright 2023-2023 - Stendhal                    *
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU Affero General Public License as        *
+ *   published by the Free Software Foundation; either version 3 of the    *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ ***************************************************************************/
+
+export interface ImageWithDimensions {
+	height: number;
+	width: number
+}
\ No newline at end of file
diff --git a/srcjs/stendhal/entity/RPEntity.ts b/srcjs/stendhal/entity/RPEntity.ts
index 2ae32db26f..e44aa91b0c 100644
--- a/srcjs/stendhal/entity/RPEntity.ts
+++ b/srcjs/stendhal/entity/RPEntity.ts
@@ -21,6 +21,7 @@ import { EmojiSprite } from "../sprite/EmojiSprite";
 import { SpeechBubble } from "../sprite/SpeechBubble";
 import { TextSprite } from "../sprite/TextSprite";
 import { SoundManager } from "../ui/SoundManager";
+import { ImageWithDimensions } from "data/ImageWithDimensions";
 
 declare var marauroa: any;
 declare var stendhal: any;
@@ -535,7 +536,7 @@ export class RPEntity extends ActiveEntity {
 	 * @param {CanvasRenderingContext2D} ctx
 	 * @param {Image} image
 	 */
-	drawSpriteImage(ctx: CanvasRenderingContext2D, image: CanvasImageSource) {
+	drawSpriteImage(ctx: CanvasRenderingContext2D, image: CanvasImageSource & ImageWithDimensions) {
 		var localX = this["_x"] * 32;
 		var localY = this["_y"] * 32;
 		if (image.height) { // image.complete is true on missing image files
diff --git a/srcjs/stendhal/sprite/ImageSprite.ts b/srcjs/stendhal/sprite/ImageSprite.ts
index f0fa55250b..3e25d125f2 100644
--- a/srcjs/stendhal/sprite/ImageSprite.ts
+++ b/srcjs/stendhal/sprite/ImageSprite.ts
@@ -10,6 +10,7 @@
  *                                                                         *
  ***************************************************************************/
 
+import { ImageWithDimensions } from "data/ImageWithDimensions";
 import { EmptySprite } from "./EmptySprite";
 import { Sprite } from "./Sprite";
 
@@ -24,7 +25,7 @@ import { Sprite } from "./Sprite";
 export class ImageSprite implements Sprite {
 
     /** The image to be drawn for this sprite. */
-    private image: CanvasImageSource;
+    private image: CanvasImageSource & ImageWithDimensions;
 
     /**
      * The identifier reference.
@@ -39,7 +40,7 @@ export class ImageSprite implements Sprite {
      * @param reference
      *            The sprite reference, or null.
      */
-    public constructor (image: CanvasImageSource | Sprite, reference?: object) {
+    public constructor (image: CanvasImageSource & ImageWithDimensions | Sprite, reference?: object) {
         if (image instanceof Sprite) {
             this.image = ImageSprite.createCompatibleImage(image);
         } else {