diff --git a/package-lock.json b/package-lock.json
index cb9e10181..45819c46c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -49,7 +49,7 @@
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-        "@vitest/coverage-c8": "^0.24.5",
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@@ -60,7 +60,7 @@
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         "typescript": "^4.8.4",
         "vite": "^3.0.9",
-        "vitest": "^0.24.5"
+        "vitest": "^0.25.1"
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         "node": ">=16"
@@ -1015,13 +1015,13 @@
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-      "resolved": "https://registry.npmjs.org/@vitest/coverage-c8/-/coverage-c8-0.24.5.tgz",
-      "integrity": "sha512-955yK/SdSBZPYrSXgXB0F+0JnOX5EY9kSL7ywJ4rNajmkFUhwLjuKm13Xb6YKSyIY/g5WvbBnyowqfNRxBJ3ww==",
+      "version": "0.25.1",
+      "resolved": "https://registry.npmjs.org/@vitest/coverage-c8/-/coverage-c8-0.25.1.tgz",
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       "dev": true,
       "dependencies": {
         "c8": "^7.12.0",
-        "vitest": "0.24.5"
+        "vitest": "0.25.1"
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         "url": "https://github.com/sponsors/antfu"
@@ -1202,6 +1202,15 @@
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       "dev": true
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+    "node_modules/acorn-walk": {
+      "version": "8.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-8.2.0.tgz",
+      "integrity": "sha512-k+iyHEuPgSw6SbuDpGQM+06HQUa04DZ3o+F6CSzXMvvI5KMvnaEqXe+YVe555R9nn6GPt404fos4wcgpw12SDA==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
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@@ -10102,17 +10111,20 @@
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-      "resolved": "https://registry.npmjs.org/vitest/-/vitest-0.24.5.tgz",
-      "integrity": "sha512-zw6JhPUHtLILQDe5Q39b/SzoITkG+R7hcFjuthp4xsi6zpmfQPOZcHodZ+3bqoWl4EdGK/p1fuMiEwdxgbGLOA==",
+      "version": "0.25.1",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-0.25.1.tgz",
+      "integrity": "sha512-eH74h6MkuEgsqR4mAQZeMK9O0PROiKY+i+1GMz/fBi5A3L2ml5U7JQs7LfPU7+uWUziZyLHagl+rkyfR8SLhlA==",
       "dev": true,
       "dependencies": {
         "@types/chai": "^4.3.3",
         "@types/chai-subset": "^1.3.3",
         "@types/node": "*",
+        "acorn": "^8.8.0",
+        "acorn-walk": "^8.2.0",
         "chai": "^4.3.6",
         "debug": "^4.3.4",
         "local-pkg": "^0.4.2",
+        "source-map": "^0.6.1",
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         "tinybench": "^2.3.1",
         "tinypool": "^0.3.0",
@@ -10153,6 +10165,18 @@
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+    "node_modules/vitest/node_modules/acorn": {
+      "version": "8.8.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.8.1.tgz",
+      "integrity": "sha512-7zFpHzhnqYKrkYdUjF1HI1bzd0VygEGX8lFk4k5zVMqHEoES+P+7TKI+EvLO9WVMJ8eekdO0aDEK044xTXwPPA==",
+      "dev": true,
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
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       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-2.4.0.tgz",
@@ -11297,13 +11321,13 @@
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     "@vitest/coverage-c8": {
-      "version": "0.24.5",
-      "resolved": "https://registry.npmjs.org/@vitest/coverage-c8/-/coverage-c8-0.24.5.tgz",
-      "integrity": "sha512-955yK/SdSBZPYrSXgXB0F+0JnOX5EY9kSL7ywJ4rNajmkFUhwLjuKm13Xb6YKSyIY/g5WvbBnyowqfNRxBJ3ww==",
+      "version": "0.25.1",
+      "resolved": "https://registry.npmjs.org/@vitest/coverage-c8/-/coverage-c8-0.25.1.tgz",
+      "integrity": "sha512-gpl5QNaNeIN0mfRiosCqBFoZcizb5GA458TDnOQXkGDc4kklazxn70u9evGfV62wiiAUfGGebgRhxlBkAa6m6g==",
       "dev": true,
       "requires": {
         "c8": "^7.12.0",
-        "vitest": "0.24.5"
+        "vitest": "0.25.1"
       }
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     "@webassemblyjs/ast": {
@@ -11472,6 +11496,12 @@
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       "dev": true
     },
+    "acorn-walk": {
+      "version": "8.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-8.2.0.tgz",
+      "integrity": "sha512-k+iyHEuPgSw6SbuDpGQM+06HQUa04DZ3o+F6CSzXMvvI5KMvnaEqXe+YVe555R9nn6GPt404fos4wcgpw12SDA==",
+      "dev": true
+    },
     "add-stream": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/add-stream/-/add-stream-1.0.0.tgz",
@@ -17997,22 +18027,33 @@
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-      "resolved": "https://registry.npmjs.org/vitest/-/vitest-0.24.5.tgz",
-      "integrity": "sha512-zw6JhPUHtLILQDe5Q39b/SzoITkG+R7hcFjuthp4xsi6zpmfQPOZcHodZ+3bqoWl4EdGK/p1fuMiEwdxgbGLOA==",
+      "version": "0.25.1",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-0.25.1.tgz",
+      "integrity": "sha512-eH74h6MkuEgsqR4mAQZeMK9O0PROiKY+i+1GMz/fBi5A3L2ml5U7JQs7LfPU7+uWUziZyLHagl+rkyfR8SLhlA==",
       "dev": true,
       "requires": {
         "@types/chai": "^4.3.3",
         "@types/chai-subset": "^1.3.3",
         "@types/node": "*",
+        "acorn": "^8.8.0",
+        "acorn-walk": "^8.2.0",
         "chai": "^4.3.6",
         "debug": "^4.3.4",
         "local-pkg": "^0.4.2",
+        "source-map": "^0.6.1",
         "strip-literal": "^0.4.2",
         "tinybench": "^2.3.1",
         "tinypool": "^0.3.0",
         "tinyspy": "^1.0.2",
         "vite": "^3.0.0"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "8.8.1",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.8.1.tgz",
+          "integrity": "sha512-7zFpHzhnqYKrkYdUjF1HI1bzd0VygEGX8lFk4k5zVMqHEoES+P+7TKI+EvLO9WVMJ8eekdO0aDEK044xTXwPPA==",
+          "dev": true
+        }
       }
     },
     "watchpack": {
diff --git a/package.json b/package.json
index 56894c21c..008f19ed4 100644
--- a/package.json
+++ b/package.json
@@ -74,7 +74,7 @@
     "@types/split2": "^3.2.1",
     "@types/workerpool": "^6.1.0",
     "@types/yargs": "^17.0.13",
-    "@vitest/coverage-c8": "^0.24.5",
+    "@vitest/coverage-c8": "^0.25.1",
     "c8": "^7.12.0",
     "eslint": "^8.26.0",
     "google-closure-compiler": "^20220803.0.0",
@@ -85,7 +85,7 @@
     "standard-version": "^9.3.2",
     "typescript": "^4.8.4",
     "vite": "^3.0.9",
-    "vitest": "^0.24.5"
+    "vitest": "^0.25.1"
   },
   "homepage": "https://github.com/cybozu/duck",
   "repository": {