diff --git a/package.json b/package.json
index 621e8c9..23346ed 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
   },
   "homepage": "https://github.com/hitokoto-osc/koa-respond#readme",
   "devDependencies": {
-    "chai": "4.2.0",
+    "chai": "4.3.0",
     "coveralls": "3.1.0",
     "eslint": "7.7.0",
     "eslint-config-prettier": "6.11.0",
diff --git a/yarn.lock b/yarn.lock
index a8f3534..3c57201 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -277,10 +277,10 @@ caseless@~0.12.0:
   version "0.12.0"
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
 
-chai@4.2.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/chai/-/chai-4.2.0.tgz#760aa72cf20e3795e84b12877ce0e83737aa29e5"
-  integrity sha512-XQU3bhBukrOsQCuwZndwGcCVQHyZi53fQ6Ys1Fym7E4olpIqqZZhhoFJoaKVvV17lWQoXYwgWN2nF5crA8J2jw==
+chai@4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/chai/-/chai-4.3.0.tgz#5523a5faf7f819c8a92480d70a8cccbadacfc25f"
+  integrity sha512-/BFd2J30EcOwmdOgXvVsmM48l0Br0nmZPlO0uOW4XKh6kpsUumRXBgPV+IlaqFaqr9cYbeoZAM1Npx0i4A+aiA==
   dependencies:
     assertion-error "^1.1.0"
     check-error "^1.0.2"