diff --git a/package.json b/package.json
index fdda4cd66..d79f0e79e 100644
--- a/package.json
+++ b/package.json
@@ -94,7 +94,6 @@
     "get-relative-luminance": "1.0.0",
     "husky": "9.0.11",
     "inquirer-autocomplete-standalone": "0.8.1",
-    "is-ci": "3.0.1",
     "jsonschema": "1.4.1",
     "markdown-link-check": "3.11.2",
     "mocha": "10.2.0",
@@ -117,7 +116,7 @@
     "jsonlint": "node scripts/lint/jsonlint.js",
     "svglint": "svglint --ci $npm_config_icons",
     "wslint": "editorconfig-checker",
-    "prepare": "is-ci || husky",
+    "prepare": "node -e 'process.exit(!!process.env.CI ? 0 : 1)' || husky",
     "prepublishOnly": "npm run build",
     "postpublish": "npm run clean",
     "test": "mocha tests --reporter tests/min-reporter.cjs --inline-diffs",