diff --git a/package-lock.json b/package-lock.json
index c82b28f..a640155 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,6 +21,7 @@
         "rollup": "^3.28.1",
         "semver": "^7.5.4",
         "serve": "^14.2.1",
+        "spine40": "npm:@esotericsoftware/spine-core@4.0",
         "spine41": "npm:@esotericsoftware/spine-core@4.1"
       }
     },
@@ -5343,6 +5344,13 @@
       "integrity": "sha512-XkD+zwiqXHikFZm4AX/7JSCXA98U5Db4AFd5XUg/+9UNtnH75+Z9KxtpYiJZx36mUDVOwH83pl7yvCer6ewM3w==",
       "dev": true
     },
+    "node_modules/spine40": {
+      "name": "@esotericsoftware/spine-core",
+      "version": "4.0.28",
+      "resolved": "https://registry.npmjs.org/@esotericsoftware/spine-core/-/spine-core-4.0.28.tgz",
+      "integrity": "sha512-Gylet5qbhzxIgG3+ht1dJrObf6TozY1ZEBJqqTZG2NKaNb7gJNgwRNPAe27wD2Kmen39ITtWdXYHNeB1ocbNpw==",
+      "dev": true
+    },
     "node_modules/spine41": {
       "name": "@esotericsoftware/spine-core",
       "version": "4.1.37",
diff --git a/package.json b/package.json
index 5c8557c..01f417a 100644
--- a/package.json
+++ b/package.json
@@ -41,6 +41,7 @@
     "rollup": "^3.28.1",
     "semver": "^7.5.4",
     "serve": "^14.2.1",
+    "spine40": "npm:@esotericsoftware/spine-core@4.0",
     "spine41": "npm:@esotericsoftware/spine-core@4.1"
   },
   "scripts": {