diff --git a/spine-unity/Modules/com.esotericsoftware.spine.ui-toolkit/package.json b/spine-unity/Modules/com.esotericsoftware.spine.ui-toolkit/package.json
index c27b053ff..b1a46f600 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.ui-toolkit/package.json
+++ b/spine-unity/Modules/com.esotericsoftware.spine.ui-toolkit/package.json
@@ -10,7 +10,8 @@
     "url": "http://esotericsoftware.com/"
   },
   "dependencies": {
-    "com.unity.modules.uielements": "1.0.0"
+    "com.unity.modules.uielements": "1.0.0",
+    "com.esotericsoftware.spine.spine-unity": "4.2.21"
   },
   "keywords": [
     "spine",