diff --git a/doc/manual/usage.md b/doc/manual/usage.md
index 92be06a..89e2021 100644
--- a/doc/manual/usage.md
+++ b/doc/manual/usage.md
@@ -1,11 +1,11 @@
 # Usage
 
 The code needs a ES2015+ polyfill to work, for example
-[@babel/polyfill](https://babeljs.io/docs/usage/polyfill).
+[regenerator-runtime/runtime](https://babeljs.io/docs/usage/polyfill).
 ```js
-require( '@babel/polyfill' ) ;
+require( 'regenerator-runtime/runtime' ) ;
 // or
-import '@babel/polyfill' ;
+import 'regenerator-runtime/runtime' ;
 ```
 
 Then
diff --git a/package.json b/package.json
index 7cbdb1f..2ef7262 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,6 @@
   "devDependencies": {
     "@aureooms/js-itertools": "5.0.1",
     "@babel/core": "7.13.10",
-    "@babel/polyfill": "7.12.1",
     "@babel/preset-env": "7.13.10",
     "@babel/register": "7.13.8",
     "@commitlint/cli": "12.0.1",
@@ -78,6 +77,7 @@
     "np": "7.4.0",
     "pinst": "2.1.6",
     "power-assert": "1.6.1",
+    "regenerator-runtime": "0.13.7",
     "xo": "0.38.2"
   },
   "ava": {
@@ -85,7 +85,7 @@
       "test/src/**/*"
     ],
     "require": [
-      "@babel/polyfill",
+      "regenerator-runtime/runtime",
       "@babel/register"
     ],
     "timeout": "1m"
diff --git a/yarn.lock b/yarn.lock
index 386a5cf..415533a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -980,14 +980,6 @@
     "@babel/helper-create-regexp-features-plugin" "^7.12.13"
     "@babel/helper-plugin-utils" "^7.12.13"
 
-"@babel/polyfill@7.12.1":
-  version "7.12.1"
-  resolved "https://registry.yarnpkg.com/@babel/polyfill/-/polyfill-7.12.1.tgz#1f2d6371d1261bbd961f3c5d5909150e12d0bd96"
-  integrity sha512-X0pi0V6gxLi6lFZpGmeNa4zxtwEmCs42isWLNjZZDE0Y8yVfgu0T2OAHlzBbdYlqbW/YXVvoBHpATEM+goCj8g==
-  dependencies:
-    core-js "^2.6.5"
-    regenerator-runtime "^0.13.4"
-
 "@babel/preset-env@7.13.10", "@babel/preset-env@^7.12.11":
   version "7.13.10"
   resolved "https://registry.yarnpkg.com/@babel/preset-env/-/preset-env-7.13.10.tgz#b5cde31d5fe77ab2a6ab3d453b59041a1b3a5252"
@@ -3191,7 +3183,7 @@ core-js@^2.0.0:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.12.tgz#d9333dfa7b065e347cc5682219d6f690859cc2ec"
   integrity sha512-Kb2wC0fvsWfQrgk8HU5lW6U/Lcs8+9aaYcy4ZFc6DDlo4nZ7n70dEgE5rtR0oG6ufKDUnrwfWL1mXR5ljDatrQ==
 
-core-js@^2.4.0, core-js@^2.6.5:
+core-js@^2.4.0:
   version "2.6.11"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.11.tgz#38831469f9922bded8ee21c9dc46985e0399308c"
   integrity sha512-5wjnpaT/3dV+XB4borEsnAYQchn00XSgTAWKDkEqv+K8KevjbzmofK6hfJ9TZIlpj2N0xQpazy7PiRQiWHqzWg==
@@ -8586,6 +8578,11 @@ regenerate@^1.4.0:
   resolved "https://registry.yarnpkg.com/regenerate/-/regenerate-1.4.1.tgz#cad92ad8e6b591773485fbe05a485caf4f457e6f"
   integrity sha512-j2+C8+NtXQgEKWk49MMP5P/u2GhnahTtVkRIHr5R5lVRlbKvmQ+oS+A5aLKWp2ma5VkT8sh6v+v4hbH0YHR66A==
 
+regenerator-runtime@0.13.7:
+  version "0.13.7"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.7.tgz#cac2dacc8a1ea675feaabaeb8ae833898ae46f55"
+  integrity sha512-a54FxoJDIr27pgf7IgeQGxmqUNYrcV338lf/6gH456HZ/PhX+5BcwHXG9ajESmwe6WRO0tAzRUrRmNONWgkrew==
+
 regenerator-runtime@^0.11.0:
   version "0.11.1"
   resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz#be05ad7f9bf7d22e056f9726cee5017fbf19e2e9"