diff --git a/package-lock.json b/package-lock.json
index 4b7d91e..fceff1b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,7 @@
       "dependencies": {
         "@pixi/particle-emitter": "^5.0.4",
         "core-js": "^3.6.5",
+        "is-plain-object": "^5.0.0",
         "jest-environment-jsdom": "^28.1.1",
         "lodash.clonedeep": "^4.5.0",
         "lz-string": "^1.4.4",
@@ -6053,6 +6054,18 @@
         "node": ">=6"
       }
     },
+    "node_modules/clone-deep/node_modules/is-plain-object": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-2.0.4.tgz",
+      "integrity": "sha512-h5PpgXkWitc38BBMYawTYMWJHFZJVnBquFE57xFpjB8pJFiF6gZ+bU+WyI/yqXiFR5mdLsgYNaPe8uao6Uv9Og==",
+      "dev": true,
+      "dependencies": {
+        "isobject": "^3.0.1"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/co": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
@@ -9173,13 +9186,9 @@
       }
     },
     "node_modules/is-plain-object": {
-      "version": "2.0.4",
-      "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-2.0.4.tgz",
-      "integrity": "sha512-h5PpgXkWitc38BBMYawTYMWJHFZJVnBquFE57xFpjB8pJFiF6gZ+bU+WyI/yqXiFR5mdLsgYNaPe8uao6Uv9Og==",
-      "dev": true,
-      "dependencies": {
-        "isobject": "^3.0.1"
-      },
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-5.0.0.tgz",
+      "integrity": "sha512-VRSzKkbMm5jMDoKLbltAkFQ5Qr7VDiTFGXxYFXXowVj387GeGNOCsOH6Msy00SGZ3Fp84b1Naa1psqgcCIEP5Q==",
       "engines": {
         "node": ">=0.10.0"
       }
@@ -21484,6 +21493,17 @@
         "is-plain-object": "^2.0.4",
         "kind-of": "^6.0.2",
         "shallow-clone": "^3.0.0"
+      },
+      "dependencies": {
+        "is-plain-object": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-2.0.4.tgz",
+          "integrity": "sha512-h5PpgXkWitc38BBMYawTYMWJHFZJVnBquFE57xFpjB8pJFiF6gZ+bU+WyI/yqXiFR5mdLsgYNaPe8uao6Uv9Og==",
+          "dev": true,
+          "requires": {
+            "isobject": "^3.0.1"
+          }
+        }
       }
     },
     "co": {
@@ -23777,13 +23797,9 @@
       "dev": true
     },
     "is-plain-object": {
-      "version": "2.0.4",
-      "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-2.0.4.tgz",
-      "integrity": "sha512-h5PpgXkWitc38BBMYawTYMWJHFZJVnBquFE57xFpjB8pJFiF6gZ+bU+WyI/yqXiFR5mdLsgYNaPe8uao6Uv9Og==",
-      "dev": true,
-      "requires": {
-        "isobject": "^3.0.1"
-      }
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-5.0.0.tgz",
+      "integrity": "sha512-VRSzKkbMm5jMDoKLbltAkFQ5Qr7VDiTFGXxYFXXowVj387GeGNOCsOH6Msy00SGZ3Fp84b1Naa1psqgcCIEP5Q=="
     },
     "is-potential-custom-element-name": {
       "version": "1.0.1",
diff --git a/package.json b/package.json
index 9a54924..4cb6a6d 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
   "dependencies": {
     "@pixi/particle-emitter": "^5.0.4",
     "core-js": "^3.6.5",
+    "is-plain-object": "^5.0.0",
     "jest-environment-jsdom": "^28.1.1",
     "lodash.clonedeep": "^4.5.0",
     "lz-string": "^1.4.4",
diff --git a/src/game/player.ts b/src/game/player.ts
index f181b49..e6ed9d7 100644
--- a/src/game/player.ts
+++ b/src/game/player.ts
@@ -1,5 +1,5 @@
 import Decimal from "util/bignum";
-import { isPlainObject } from "util/common";
+import { isPlainObject } from "is-plain-object";
 import { ProxiedWithState, ProxyPath, ProxyState } from "util/proxies";
 import { reactive, unref } from "vue";
 import transientState from "./state";
@@ -51,11 +51,7 @@ const playerHandler: ProxyHandler<Record<PropertyKey, any>> = {
         }
 
         const value = target[ProxyState][key];
-        if (
-            key !== "value" &&
-            (isPlainObject(value) || Array.isArray(value)) &&
-            !(value instanceof Decimal)
-        ) {
+        if (key !== "value" && (isPlainObject(value) || Array.isArray(value))) {
             if (value !== target[key]?.[ProxyState]) {
                 const path = [...target[ProxyPath], key];
                 target[key] = new Proxy({ [ProxyState]: value, [ProxyPath]: path }, playerHandler);
diff --git a/src/util/common.ts b/src/util/common.ts
index 3a7d217..0e4f829 100644
--- a/src/util/common.ts
+++ b/src/util/common.ts
@@ -8,10 +8,6 @@ export function camelToTitle(camel: string): string {
     return title;
 }
 
-export function isPlainObject(object: unknown): boolean {
-    return Object.prototype.toString.call(object) === "[object Object]";
-}
-
 // eslint-disable-next-line @typescript-eslint/ban-types
 export function isFunction(func: unknown): func is Function {
     return typeof func === "function";