diff --git a/package.json b/package.json
index 2d317b38..fb26a9d9 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,6 @@
     "lint": "eslint --config .eslintrc \"./**/*.js\""
   },
   "dependencies": {
-    "core-js": "^3.14.0",
     "prism-react-renderer": "^1.2.1",
     "sucrase": "^3.20.3",
     "use-editable": "^2.3.3"
diff --git a/src/utils/transpile/evalCode.js b/src/utils/transpile/evalCode.js
index 5ad8ab21..765f738b 100644
--- a/src/utils/transpile/evalCode.js
+++ b/src/utils/transpile/evalCode.js
@@ -1,14 +1,7 @@
-import React from "react";
-import assign from "core-js/features/object/assign";
-
-export const _poly = { assign };
-
 const evalCode = (code, scope) => {
   const scopeKeys = Object.keys(scope);
   const scopeValues = scopeKeys.map((key) => scope[key]);
-  // eslint-disable-next-line no-new-func
-  const res = new Function("_poly", "React", ...scopeKeys, code);
-  return res(_poly, React, ...scopeValues);
+  return new Function(...scopeKeys, code)(...scopeValues);
 };
 
 export default evalCode;
diff --git a/src/utils/transpile/index.js b/src/utils/transpile/index.js
index 6684a65e..4ff2601e 100644
--- a/src/utils/transpile/index.js
+++ b/src/utils/transpile/index.js
@@ -1,3 +1,4 @@
+import React from "react";
 import transform from "./transform";
 import errorBoundary from "./errorBoundary";
 import evalCode from "./evalCode";
@@ -8,7 +9,10 @@ export const generateElement = ({ code = "", scope = {} }, errorCallback) => {
 
   // NOTE: Workaround for classes and arrow functions.
   const transformed = transform(`return (${codeTrimmed})`).trim();
-  return errorBoundary(evalCode(transformed, scope), errorCallback);
+  return errorBoundary(
+    evalCode(transformed, { React, ...scope }),
+    errorCallback
+  );
 };
 
 export const renderElementAsync = (
@@ -31,5 +35,5 @@ export const renderElementAsync = (
     );
   }
 
-  evalCode(transform(code), { ...scope, render });
+  evalCode(transform(code), { React, ...scope, render });
 };
diff --git a/yarn.lock b/yarn.lock
index c8abbdb3..bad5cdfd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4363,11 +4363,6 @@ core-js@^3.0.4, core-js@^3.6.5, core-js@^3.8.2:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.16.0.tgz#1d46fb33720bc1fa7f90d20431f36a5540858986"
   integrity sha512-5+5VxRFmSf97nM8Jr2wzOwLqRo6zphH2aX+7KsAUONObyzakDNq2G/bgbhinxB4PoV9L3aXQYhiDKyIKWd2c8g==
 
-core-js@^3.14.0:
-  version "3.14.0"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.14.0.tgz#62322b98c71cc2018b027971a69419e2425c2a6c"
-  integrity sha512-3s+ed8er9ahK+zJpp9ZtuVcDoFzHNiZsPbNAAE4KXgrRHbjSqqNN6xGSXq6bq7TZIbKj4NLrLb6bJ5i+vSVjHA==
-
 core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"