diff --git a/.changeset/moody-owls-return.md b/.changeset/moody-owls-return.md
new file mode 100644
index 00000000000..70eb2482fc3
--- /dev/null
+++ b/.changeset/moody-owls-return.md
@@ -0,0 +1,5 @@
+---
+'@clerk/clerk-js': patch
+---
+
+Improve compatibility with Safari 12 by removing modern JavaScript syntax.
diff --git a/packages/clerk-js/bundlewatch.config.json b/packages/clerk-js/bundlewatch.config.json
index 4f9611d9592..9e8093a5971 100644
--- a/packages/clerk-js/bundlewatch.config.json
+++ b/packages/clerk-js/bundlewatch.config.json
@@ -5,7 +5,7 @@
     { "path": "./dist/clerk.headless.js", "maxSize": "48kB" },
     { "path": "./dist/ui-common*.js", "maxSize": "89KB" },
     { "path": "./dist/vendors*.js", "maxSize": "25KB" },
-    { "path": "./dist/coinbase*.js", "maxSize": "35.2KB" },
+    { "path": "./dist/coinbase*.js", "maxSize": "35.5KB" },
     { "path": "./dist/createorganization*.js", "maxSize": "5KB" },
     { "path": "./dist/impersonationfab*.js", "maxSize": "5KB" },
     { "path": "./dist/organizationprofile*.js", "maxSize": "12KB" },
diff --git a/packages/clerk-js/rspack.config.js b/packages/clerk-js/rspack.config.js
index dff4ece9726..9c6b23a7c64 100644
--- a/packages/clerk-js/rspack.config.js
+++ b/packages/clerk-js/rspack.config.js
@@ -173,6 +173,17 @@ const typescriptLoaderProd = () => {
         },
       },
     },
+    {
+      test: /\.m?js$/,
+      use: {
+        loader: 'builtin:swc-loader',
+        options: {
+          env: {
+            targets: packageJSON.browserslist,
+          },
+        },
+      },
+    },
   ];
 };