diff --git a/lib/esbuild.config.js b/lib/esbuild.config.js
index 20725b3..e3c5f01 100644
--- a/lib/esbuild.config.js
+++ b/lib/esbuild.config.js
@@ -109,10 +109,12 @@ if (WATCH) {
   // Add Polyfills
   await build({
     ...config,
-    entryPoints: [resolve(SRC, '../polyfills.js')],
-    format: 'cjs',
+    entryPoints: [resolve(SRC, 'polyfills.ts')],
     outfile: resolve(DIST, 'polyfills.js'),
     treeShaking: true,
+    target: [
+      'es5',
+    ]
   });
 
   if (DEBUG) {
diff --git a/lib/package.json b/lib/package.json
index 8cef576..baea3df 100644
--- a/lib/package.json
+++ b/lib/package.json
@@ -12,7 +12,8 @@
     "test:unit": "jest"
   },
   "dependencies": {
-    "@sentry/browser": "^7.73.0"
+    "@sentry/browser": "^7.73.0",
+    "core-js": "^3.35.1"
   },
   "devDependencies": {
     "@hcaptcha/types": "^1.0.3",
diff --git a/lib/polyfills.js b/lib/polyfills.js
deleted file mode 100644
index fde7522..0000000
--- a/lib/polyfills.js
+++ /dev/null
@@ -1,88 +0,0 @@
-// Polyfills for ES5 browser support
-
-if (!Object.entries) {
-  Object.entries = function (obj) {
-    if (obj == null) {
-      throw new TypeError('Object.entries called on null or undefined');
-    }
-
-    var entries = [];
-    for (var key in obj) {
-      if (Object.prototype.hasOwnProperty.call(obj, key)) {
-        entries.push([key, obj[key]]);
-      }
-    }
-
-    return entries;
-  };
-}
-
-if (typeof Object.assign !== 'function') {
-  Object.assign = function (target) {
-    if (target == null) {
-      throw new TypeError('Cannot convert undefined or null to object');
-    }
-
-    target = Object(target);
-
-    for (var index = 1; index < arguments.length; index++) {
-      var source = arguments[index];
-
-      if (source != null) {
-        for (var key in source) {
-          if (Object.prototype.hasOwnProperty.call(source, key)) {
-            target[key] = source[key];
-          }
-        }
-      }
-    }
-
-    return target;
-  };
-}
-
-if (!Array.prototype.find) {
-  Object.defineProperty(Array.prototype, 'find', {
-    value: function (predicate, thisArg) {
-      if (this == null) {
-        throw new TypeError('Array.prototype.find called on null or undefined');
-      }
-
-      if (typeof predicate !== 'function') {
-        throw new TypeError('predicate must be a function');
-      }
-
-      var array = Object(this);
-      var length = array.length >>> 0;
-
-      for (var i = 0; i < length; i++) {
-        var value = array[i];
-        if (predicate.call(thisArg, value, i, array)) {
-          return value;
-        }
-      }
-
-      return undefined;
-    },
-    configurable: true,
-    writable: true
-  });
-}
-
-if (!Object.getOwnPropertyDescriptors) {
-  Object.defineProperty(Object, 'getOwnPropertyDescriptors', {
-    value: function(obj) {
-      var descriptors = {};
-
-      for (var key in obj) {
-        if (Object.prototype.hasOwnProperty.call(obj, key)) {
-          descriptors[key] = Object.getOwnPropertyDescriptor(obj, key);
-        }
-      }
-
-      return descriptors;
-    },
-    configurable: true,
-    writable: true
-  });
-}
diff --git a/lib/src/polyfills.ts b/lib/src/polyfills.ts
new file mode 100644
index 0000000..b46d37b
--- /dev/null
+++ b/lib/src/polyfills.ts
@@ -0,0 +1,4 @@
+import 'core-js/es/array/find';
+import 'core-js/es/object/assign';
+import 'core-js/es/object/entries';
+import 'core-js/es/object/get-own-property-descriptors';
diff --git a/lib/tsconfig.types.json b/lib/tsconfig.types.json
index 35f4d01..8cf2a7b 100644
--- a/lib/tsconfig.types.json
+++ b/lib/tsconfig.types.json
@@ -13,5 +13,8 @@
 
   "include": [
     "src/**/*"
+  ],
+  "exclude": [
+    "src/polyfills.ts"
   ]
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2433bb8..5065438 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1,5 +1,9 @@
 lockfileVersion: '6.0'
 
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
 importers:
 
   .:
@@ -43,6 +47,9 @@ importers:
       '@sentry/browser':
         specifier: ^7.73.0
         version: 7.73.0
+      core-js:
+        specifier: ^3.35.1
+        version: 3.35.1
     devDependencies:
       '@hcaptcha/types':
         specifier: ^1.0.3
@@ -2171,6 +2178,11 @@ packages:
     resolution: {integrity: sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==}
     dev: true
 
+  /core-js@3.35.1:
+    resolution: {integrity: sha512-IgdsbxNyMskrTFxa9lWHyMwAJU5gXOPP+1yO+K59d50VLVAIDAbs7gIv705KzALModfK3ZrSZTPNpC0PQgIZuw==}
+    requiresBuild: true
+    dev: false
+
   /corser@2.0.1:
     resolution: {integrity: sha512-utCYNzRSQIZNPIcGZdQc92UVJYAhtGAteCFg0yRaFm8f0P+CPtyGyHXJcGXnffjCybUCEx3FQ2G7U3/o9eIkVQ==}
     engines: {node: '>= 0.4.0'}