diff --git a/package-lock.json b/package-lock.json
index a6bb36b..898b882 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "4.1.0",
       "license": "MIT",
       "dependencies": {
-        "@asamuzakjp/css-color": "^2.2.1",
+        "@asamuzakjp/css-color": "^2.3.0",
         "rrweb-cssom": "^0.7.1"
       },
       "devDependencies": {
@@ -30,12 +30,13 @@
       }
     },
     "node_modules/@asamuzakjp/css-color": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-2.2.1.tgz",
-      "integrity": "sha512-4/RoWIs1GTq3Bm7Xyh1cjRC1h+nyMqoB23Twr5vnbyNqWx5FTbBq7Pb70IovyL6vZbi8vlsoyx03bIBl0U61FA==",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-2.3.0.tgz",
+      "integrity": "sha512-vDI1tl26mhkepjjDW6th+vM8p6kEqUsdQy+GwYkAWIS7Uo85nV9Zf8FZLb4RGzWjKeys3KOHEyUwRd20TxdXBw==",
       "license": "MIT",
       "dependencies": {
         "@csstools/css-calc": "^2.1.0",
+        "@csstools/css-tokenizer": "^3.0.3",
         "lru-cache": "^11.0.2"
       }
     },
@@ -241,7 +242,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
diff --git a/package.json b/package.json
index f7dcd65..4c21398 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
   ],
   "main": "./lib/CSSStyleDeclaration.js",
   "dependencies": {
-    "@asamuzakjp/css-color": "^2.2.1",
+    "@asamuzakjp/css-color": "^2.3.0",
     "rrweb-cssom": "^0.7.1"
   },
   "devDependencies": {