diff --git a/.changeset/spotty-zebras-sip.md b/.changeset/spotty-zebras-sip.md
new file mode 100644
index 000000000..dc1dbdabf
--- /dev/null
+++ b/.changeset/spotty-zebras-sip.md
@@ -0,0 +1,6 @@
+---
+'@lion/core': minor
+'@lion/listbox': minor
+---
+
+Remove closestPolyfill
diff --git a/packages/core/closestPolyfill.js b/packages/core/closestPolyfill.js
deleted file mode 100644
index b0cdc02d6..000000000
--- a/packages/core/closestPolyfill.js
+++ /dev/null
@@ -1 +0,0 @@
-import './src/closestPolyfill.js';
diff --git a/packages/core/package.json b/packages/core/package.json
index ad7b59ff7..f10eb8ed1 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -30,9 +30,7 @@
     "prepublishOnly": "npm run publish-docs",
     "test": "cd ../../ && npm run test:browser -- --group core"
   },
-  "sideEffects": [
-    "./closestPolyfill.js"
-  ],
+  "sideEffects": false,
   "dependencies": {
     "@open-wc/dedupe-mixin": "^1.3.0",
     "@open-wc/scoped-elements": "^2.0.1",
@@ -47,7 +45,6 @@
   },
   "exports": {
     ".": "./index.js",
-    "./closestPolyfill": "./src/closestPolyfill.js",
     "./docs/*": "./docs/*"
   }
 }
diff --git a/packages/core/src/closestPolyfill.js b/packages/core/src/closestPolyfill.js
deleted file mode 100644
index 0835a7133..000000000
--- a/packages/core/src/closestPolyfill.js
+++ /dev/null
@@ -1,23 +0,0 @@
-// @ts-nocheck
-/* eslint-disable */
-
-/**
- * From: https://developer.mozilla.org/en-US/docs/Web/API/Element/closest#Polyfill
- */
-
-if (!Element.prototype.matches) {
-  Element.prototype.matches =
-    Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;
-}
-
-if (!Element.prototype.closest) {
-  Element.prototype.closest = function (s) {
-    var el = this;
-
-    do {
-      if (Element.prototype.matches.call(el, s)) return el;
-      el = el.parentElement || el.parentNode;
-    } while (el !== null && el.nodeType === 1);
-    return null;
-  };
-}
diff --git a/packages/listbox/src/ListboxMixin.js b/packages/listbox/src/ListboxMixin.js
index 68441b932..69e2d11fb 100644
--- a/packages/listbox/src/ListboxMixin.js
+++ b/packages/listbox/src/ListboxMixin.js
@@ -1,5 +1,4 @@
 import { css, dedupeMixin, html, ScopedElementsMixin, SlotMixin } from '@lion/core';
-import '@lion/core/closestPolyfill';
 import { ChoiceGroupMixin, FormControlMixin, FormRegistrarMixin } from '@lion/form-core';
 import { LionOptions } from './LionOptions.js';