diff --git a/code/core/package.json b/code/core/package.json
index a68f7f8a0d13..fe494dcc815f 100644
--- a/code/core/package.json
+++ b/code/core/package.json
@@ -340,7 +340,6 @@
     "boxen": "^7.1.1",
     "browser-dtector": "^3.4.0",
     "camelcase": "^8.0.0",
-    "chai": "^4.4.1",
     "cli-table3": "^0.6.1",
     "commander": "^12.1.0",
     "comment-parser": "^1.4.1",
diff --git a/code/lib/instrumenter/package.json b/code/lib/instrumenter/package.json
index 04d6624131ca..5cb7091d63cc 100644
--- a/code/lib/instrumenter/package.json
+++ b/code/lib/instrumenter/package.json
@@ -44,8 +44,7 @@
   },
   "dependencies": {
     "@storybook/global": "^5.0.0",
-    "@vitest/utils": "^2.0.5",
-    "util": "^0.12.4"
+    "@vitest/utils": "^2.0.5"
   },
   "devDependencies": {
     "typescript": "^5.3.2"
@@ -68,6 +67,9 @@
       "@vitest/expect",
       "@vitest/spy",
       "@vitest/utils"
+    ],
+    "externals": [
+      "util"
     ]
   },
   "gitHead": "e6a7fd8a655c69780bc20b9749c2699e44beae16"
diff --git a/code/lib/test/package.json b/code/lib/test/package.json
index e144837404fb..a66703d9bdb3 100644
--- a/code/lib/test/package.json
+++ b/code/lib/test/package.json
@@ -51,8 +51,7 @@
     "@testing-library/jest-dom": "6.5.0",
     "@testing-library/user-event": "14.5.2",
     "@vitest/expect": "2.0.5",
-    "@vitest/spy": "2.0.5",
-    "util": "^0.12.4"
+    "@vitest/spy": "2.0.5"
   },
   "devDependencies": {
     "chai": "^5.1.1",
@@ -79,6 +78,9 @@
       "@vitest/expect",
       "@vitest/spy",
       "@vitest/utils"
+    ],
+    "externals": [
+      "util"
     ]
   },
   "gitHead": "e6a7fd8a655c69780bc20b9749c2699e44beae16"
diff --git a/code/yarn.lock b/code/yarn.lock
index 875c0263c054..d55c040ded38 100644
--- a/code/yarn.lock
+++ b/code/yarn.lock
@@ -6052,7 +6052,6 @@ __metadata:
     browser-assert: "npm:^1.2.1"
     browser-dtector: "npm:^3.4.0"
     camelcase: "npm:^8.0.0"
-    chai: "npm:^4.4.1"
     cli-table3: "npm:^0.6.1"
     commander: "npm:^12.1.0"
     comment-parser: "npm:^1.4.1"
@@ -6345,7 +6344,6 @@ __metadata:
     "@storybook/global": "npm:^5.0.0"
     "@vitest/utils": "npm:^2.0.5"
     typescript: "npm:^5.3.2"
-    util: "npm:^0.12.4"
   peerDependencies:
     storybook: "workspace:^"
   languageName: unknown
@@ -7098,7 +7096,6 @@ __metadata:
     ts-dedent: "npm:^2.2.0"
     type-fest: "npm:~2.19"
     typescript: "npm:^5.3.2"
-    util: "npm:^0.12.4"
   peerDependencies:
     storybook: "workspace:^"
   languageName: unknown
@@ -10115,13 +10112,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"assertion-error@npm:^1.1.0":
-  version: 1.1.0
-  resolution: "assertion-error@npm:1.1.0"
-  checksum: 10c0/25456b2aa333250f01143968e02e4884a34588a8538fbbf65c91a637f1dbfb8069249133cd2f4e530f10f624d206a664e7df30207830b659e9f5298b00a4099b
-  languageName: node
-  linkType: hard
-
 "assertion-error@npm:^2.0.1":
   version: 2.0.1
   resolution: "assertion-error@npm:2.0.1"
@@ -11422,21 +11412,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"chai@npm:^4.4.1":
-  version: 4.5.0
-  resolution: "chai@npm:4.5.0"
-  dependencies:
-    assertion-error: "npm:^1.1.0"
-    check-error: "npm:^1.0.3"
-    deep-eql: "npm:^4.1.3"
-    get-func-name: "npm:^2.0.2"
-    loupe: "npm:^2.3.6"
-    pathval: "npm:^1.1.1"
-    type-detect: "npm:^4.1.0"
-  checksum: 10c0/b8cb596bd1aece1aec659e41a6e479290c7d9bee5b3ad63d2898ad230064e5b47889a3bc367b20100a0853b62e026e2dc514acf25a3c9385f936aa3614d4ab4d
-  languageName: node
-  linkType: hard
-
 "chai@npm:^5.1.1":
   version: 5.1.1
   resolution: "chai@npm:5.1.1"
@@ -11553,15 +11528,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"check-error@npm:^1.0.3":
-  version: 1.0.3
-  resolution: "check-error@npm:1.0.3"
-  dependencies:
-    get-func-name: "npm:^2.0.2"
-  checksum: 10c0/94aa37a7315c0e8a83d0112b5bfb5a8624f7f0f81057c73e4707729cdd8077166c6aefb3d8e2b92c63ee130d4a2ff94bad46d547e12f3238cc1d78342a973841
-  languageName: node
-  linkType: hard
-
 "check-error@npm:^2.1.1":
   version: 2.1.1
   resolution: "check-error@npm:2.1.1"
@@ -12832,15 +12798,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"deep-eql@npm:^4.1.3":
-  version: 4.1.3
-  resolution: "deep-eql@npm:4.1.3"
-  dependencies:
-    type-detect: "npm:^4.0.0"
-  checksum: 10c0/ff34e8605d8253e1bf9fe48056e02c6f347b81d9b5df1c6650a1b0f6f847b4a86453b16dc226b34f853ef14b626e85d04e081b022e20b00cd7d54f079ce9bbdd
-  languageName: node
-  linkType: hard
-
 "deep-eql@npm:^5.0.1":
   version: 5.0.2
   resolution: "deep-eql@npm:5.0.2"
@@ -15988,7 +15945,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"get-func-name@npm:^2.0.1, get-func-name@npm:^2.0.2":
+"get-func-name@npm:^2.0.1":
   version: 2.0.2
   resolution: "get-func-name@npm:2.0.2"
   checksum: 10c0/89830fd07623fa73429a711b9daecdb304386d237c71268007f788f113505ef1d4cc2d0b9680e072c5082490aec9df5d7758bf5ac6f1c37062855e8e3dc0b9df
@@ -19255,15 +19212,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"loupe@npm:^2.3.6":
-  version: 2.3.7
-  resolution: "loupe@npm:2.3.7"
-  dependencies:
-    get-func-name: "npm:^2.0.1"
-  checksum: 10c0/71a781c8fc21527b99ed1062043f1f2bb30bdaf54fa4cf92463427e1718bc6567af2988300bc243c1f276e4f0876f29e3cbf7b58106fdc186915687456ce5bf4
-  languageName: node
-  linkType: hard
-
 "loupe@npm:^3.1.0, loupe@npm:^3.1.1":
   version: 3.1.1
   resolution: "loupe@npm:3.1.1"
@@ -22519,13 +22467,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"pathval@npm:^1.1.1":
-  version: 1.1.1
-  resolution: "pathval@npm:1.1.1"
-  checksum: 10c0/f63e1bc1b33593cdf094ed6ff5c49c1c0dc5dc20a646ca9725cc7fe7cd9995002d51d5685b9b2ec6814342935748b711bafa840f84c0bb04e38ff40a335c94dc
-  languageName: node
-  linkType: hard
-
 "pathval@npm:^2.0.0":
   version: 2.0.0
   resolution: "pathval@npm:2.0.0"
@@ -27442,13 +27383,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"type-detect@npm:^4.0.0, type-detect@npm:^4.1.0":
-  version: 4.1.0
-  resolution: "type-detect@npm:4.1.0"
-  checksum: 10c0/df8157ca3f5d311edc22885abc134e18ff8ffbc93d6a9848af5b682730ca6a5a44499259750197250479c5331a8a75b5537529df5ec410622041650a7f293e2a
-  languageName: node
-  linkType: hard
-
 "type-fest@npm:~2.19":
   version: 2.19.0
   resolution: "type-fest@npm:2.19.0"