diff --git a/jest.config.js b/jest.config.js
index 45a5e6dae0..f4d505bc9d 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -15,7 +15,7 @@ const config = {
       },
     ],
   },
-  transformIgnorePatterns: ["/node_modules/(?!(yaml)/)"],
+  transformIgnorePatterns: ["/node_modules/(?!(yaml|@asamuzakjp\/css-color))"],
   setupFilesAfterEnv: ["<rootDir>/setup-jest.ts"],
   modulePathIgnorePatterns: ["<rootDir>/dist/"],
   testEnvironment: "jsdom",
diff --git a/setup-jest.ts b/setup-jest.ts
index 5584a0970f..700603beb1 100644
--- a/setup-jest.ts
+++ b/setup-jest.ts
@@ -1,3 +1,7 @@
+import { TextEncoder, TextDecoder } from 'util';
 import failOnConsole from 'jest-fail-on-console'
 
+global.TextEncoder = TextEncoder;
+global.TextDecoder = TextDecoder as typeof global.TextDecoder;
+
 failOnConsole()