diff --git a/package.json b/package.json
index 621e8c9..91c8811 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": "4.3.6",
     "coveralls": "3.1.0",
     "eslint": "7.7.0",
     "eslint-config-prettier": "6.11.0",
diff --git a/yarn.lock b/yarn.lock
index a8f3534..66d00bf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -277,16 +277,17 @@ 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@4.3.6:
+  version "4.3.6"
+  resolved "https://registry.yarnpkg.com/chai/-/chai-4.3.6.tgz#ffe4ba2d9fa9d6680cc0b370adae709ec9011e9c"
+  integrity sha512-bbcp3YfHCUzMOvKqsztczerVgBKSsEijCySNlHHbX3VG1nskvqjz5Rfso1gGwD6w6oOV3eI60pKuMOV5MV7p3Q==
   dependencies:
     assertion-error "^1.1.0"
     check-error "^1.0.2"
     deep-eql "^3.0.1"
     get-func-name "^2.0.0"
-    pathval "^1.1.0"
+    loupe "^2.3.1"
+    pathval "^1.1.1"
     type-detect "^4.0.5"
 
 chalk@^2.0.0:
@@ -1610,6 +1611,13 @@ log-symbols@3.0.0:
   dependencies:
     chalk "^2.4.2"
 
+loupe@^2.3.1:
+  version "2.3.4"
+  resolved "https://registry.yarnpkg.com/loupe/-/loupe-2.3.4.tgz#7e0b9bffc76f148f9be769cb1321d3dcf3cb25f3"
+  integrity sha512-OvKfgCC2Ndby6aSTREl5aCCPTNIzlDfQZvZxNUrBrihDhL3xcrYegTblhmEiCrg2kKQz4XsFIaemE5BF4ybSaQ==
+  dependencies:
+    get-func-name "^2.0.0"
+
 media-typer@0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/media-typer/-/media-typer-0.3.0.tgz#8710d7af0aa626f8fffa1ce00168545263255748"
@@ -1936,10 +1944,10 @@ path-type@^2.0.0:
   dependencies:
     pify "^2.0.0"
 
-pathval@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.0.tgz#b942e6d4bde653005ef6b71361def8727d0645e0"
-  integrity sha1-uULm1L3mUwBe9rcTYd74cn0GReA=
+pathval@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.1.tgz#8534e77a77ce7ac5a2512ea21e0fdb8fcf6c3d8d"
+  integrity sha512-Dp6zGqpTdETdR63lehJYPeIOqpiNBNtc7BpWSLrOje7UaIsE5aY92r/AunQA7rsXvet3lrJ3JnZX29UPTKXyKQ==
 
 performance-now@^2.1.0:
   version "2.1.0"