diff --git a/.eslintignore b/.eslintignore
index 404abb2..2fe5d09 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1 +1,2 @@
 coverage/
+lib/sinon-chai.js
\ No newline at end of file
diff --git a/.eslintrc.json b/.eslintrc.json
index f34ba89..68d3713 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -6,7 +6,11 @@
     "es6": false
   },
   "parserOptions": {
-    "ecmaVersion": 5
+    "ecmaVersion": 2015,
+    "sourceType": "module",
+    "ecmaFeatures": {
+      "modules": true
+    }
   },
   "rules": {
     // Possible errors
diff --git a/.mocharc.js b/.mocharc.js
index b362cda..2eca8c7 100644
--- a/.mocharc.js
+++ b/.mocharc.js
@@ -1,5 +1,5 @@
 "use strict";
 
 module.exports = {
-    require: ["./test/common"]
+    require: ["./test/setup.mjs"]
 };
diff --git a/lib/sinon-chai.js b/lib/sinon-chai.mjs
similarity index 89%
rename from lib/sinon-chai.js
rename to lib/sinon-chai.mjs
index 194dc3a..5040cd1 100644
--- a/lib/sinon-chai.js
+++ b/lib/sinon-chai.mjs
@@ -1,24 +1,5 @@
-"use strict";
-/* eslint-disable no-invalid-this */
-
-(function (sinonChai) {
-    // Module systems magic dance.
-
-    /* istanbul ignore else */
-    if (typeof require === "function" && typeof exports === "object" && typeof module === "object") {
-        // NodeJS
-        module.exports = sinonChai;
-    } else if (typeof define === "function" && define.amd) {
-        // AMD
-        define(function () {
-            return sinonChai;
-        });
-    } else {
-        // Other environment (usually <script> tag): plug in to global chai instance directly.
-        /* global chai: false */
-        chai.use(sinonChai);
-    }
-}(function (chai, utils) {
+
+export default function (chai, utils) {
     var slice = Array.prototype.slice;
 
     function isSpy(putativeSpy) {
@@ -146,4 +127,4 @@
     sinonMethod("calledWithMatch", "been called with arguments matching %*", "%D");
     sinonMethod("returned", "returned %1");
     exceptionalSinonMethod("thrown", "threw", "thrown %1");
-}));
+};
diff --git a/package-lock.json b/package-lock.json
index cda1e57..392101e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "sinon-chai",
-  "version": "3.4.0",
+  "version": "3.7.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -284,6 +284,12 @@
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
       "dev": true
     },
+    "@ungap/promise-all-settled": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
+      "integrity": "sha512-sL/cEvJWAnClXw0wHk85/2L0G6Sj8UB0Ctc1TEMbKSsmpRosqhwj9gWgFRZSrBr2f9tiXISwNhCPmlfqUqyb9Q==",
+      "dev": true
+    },
     "acorn": {
       "version": "7.1.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
@@ -319,9 +325,9 @@
       }
     },
     "ansi-colors": {
-      "version": "3.2.3",
-      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.3.tgz",
-      "integrity": "sha512-LEHHyuhlPY3TmuUYMh2oz89lTShfvgbmzaBcxve9t/9Wuy7Dwf4yoAKcND7KFT1HAQfqZ12qtc+DUrBMeKF9nw==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
+      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
       "dev": true
     },
     "ansi-escapes": {
@@ -349,9 +355,9 @@
       }
     },
     "anymatch": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
-      "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==",
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.2.tgz",
+      "integrity": "sha512-P43ePfOAIupkguHUycrc4qJ9kz8ZiuOUijaETwX7THt0Y/GNK7v0aa8rY816xWjZ7rJdA5XdMcpVFTKMq+RvWg==",
       "dev": true,
       "requires": {
         "normalize-path": "^3.0.0",
@@ -401,9 +407,9 @@
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     },
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-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.0.0.tgz",
-      "integrity": "sha512-Phlt0plgpIIBOGTT/ehfFnbNlfsDEiqmzE2KRXoX1bLIlir4X/MR+zSyBEkL05ffWgnRSf/DXv+WrUAVr93/ow==",
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
+      "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==",
       "dev": true
     },
     "brace-expansion": {
@@ -493,19 +499,19 @@
       "dev": true
     },
     "chokidar": {
-      "version": "3.3.0",
-      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.3.0.tgz",
-      "integrity": "sha512-dGmKLDdT3Gdl7fBUe8XK+gAtGmzy5Fn0XkkWQuYxGIgWVPPse2CxFA5mtrlD0TOHaHjEUqkWNyP1XdHoJES/4A==",
+      "version": "3.5.1",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.5.1.tgz",
+      "integrity": "sha512-9+s+Od+W0VJJzawDma/gvBNQqkTiqYTWLuZoyAsivsI4AaWTCzHG06/TMjsf1cYe9Cb97UCEhjz7HvnPk2p/tw==",
       "dev": true,
       "requires": {
         "anymatch": "~3.1.1",
         "braces": "~3.0.2",
-        "fsevents": "~2.1.1",
+        "fsevents": "~2.3.1",
         "glob-parent": "~5.1.0",
         "is-binary-path": "~2.1.0",
         "is-glob": "~4.0.1",
         "normalize-path": "~3.0.0",
-        "readdirp": "~3.2.0"
+        "readdirp": "~3.5.0"
       }
     },
     "clean-stack": {
@@ -530,37 +536,23 @@
       "dev": true
     },
     "cliui": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
-      "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
+      "version": "7.0.4",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.4.tgz",
+      "integrity": "sha512-OcRE68cOsVMXp1Yvonl/fzkQOyjLSu/8bhPDfQt0e0/Eb283TKP20Fs2MqoPsr9SwA595rRCA+QMzYc9nBP+JQ==",
       "dev": true,
       "requires": {
-        "string-width": "^3.1.0",
-        "strip-ansi": "^5.2.0",
-        "wrap-ansi": "^5.1.0"
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.0",
+        "wrap-ansi": "^7.0.0"
       },
       "dependencies": {
-        "emoji-regex": {
-          "version": "7.0.3",
-          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
-          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
-          "dev": true
-        },
-        "is-fullwidth-code-point": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
-          "dev": true
-        },
-        "string-width": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
           "dev": true,
           "requires": {
-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
+            "ansi-regex": "^5.0.0"
           }
         }
       }
@@ -661,19 +653,10 @@
         "strip-bom": "^4.0.0"
       }
     },
-    "define-properties": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
-      "integrity": "sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==",
-      "dev": true,
-      "requires": {
-        "object-keys": "^1.0.12"
-      }
-    },
     "diff": {
-      "version": "3.5.0",
-      "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
-      "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-5.0.0.tgz",
+      "integrity": "sha512-/VTCrvm5Z0JGty/BWHljh+BAiw3IK+2j87NGMu8Nwc/f48WoDAC395uomO9ZD117ZOBaHmkX1oyLvkVM/aIT3w==",
       "dev": true
     },
     "doctrine": {
@@ -691,42 +674,18 @@
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       "dev": true
     },
-    "es-abstract": {
-      "version": "1.17.4",
-      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.4.tgz",
-      "integrity": "sha512-Ae3um/gb8F0mui/jPL+QiqmglkUsaQf7FwBEHYIFkztkneosu9imhqHpBzQ3h1vit8t5iQ74t6PEVvphBZiuiQ==",
-      "dev": true,
-      "requires": {
-        "es-to-primitive": "^1.2.1",
-        "function-bind": "^1.1.1",
-        "has": "^1.0.3",
-        "has-symbols": "^1.0.1",
-        "is-callable": "^1.1.5",
-        "is-regex": "^1.0.5",
-        "object-inspect": "^1.7.0",
-        "object-keys": "^1.1.1",
-        "object.assign": "^4.1.0",
-        "string.prototype.trimleft": "^2.1.1",
-        "string.prototype.trimright": "^2.1.1"
-      }
-    },
-    "es-to-primitive": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
-      "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
-      "dev": true,
-      "requires": {
-        "is-callable": "^1.1.4",
-        "is-date-object": "^1.0.1",
-        "is-symbol": "^1.0.2"
-      }
-    },
     "es6-error": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/es6-error/-/es6-error-4.1.1.tgz",
       "integrity": "sha512-Um/+FxMr9CISWh0bi5Zv0iOD+4cFh5qLeks1qhAopKVAJw3drgKbKySikp7wGhDL0HPeaja0P5ULZrxLkniUVg==",
       "dev": true
     },
+    "escalade": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
+      "integrity": "sha512-k0er2gUkLf8O0zKJiAhmkTnJlTvINGv7ygDNPbeIsX/TJjGJZHuh9B2UxbsaEkmlEo9MfhrSzmhIlhRlI2GXnw==",
+      "dev": true
+    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
@@ -918,22 +877,20 @@
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-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
-      "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-5.0.0.tgz",
+      "integrity": "sha512-78/PXT1wlLLDgTzDs7sjq9hzz0vXD+zn+7wypEe4fXQxCmdmqfGsEPQxmiCSQI3ajFV91bVSsvNtrJRiW6nGng==",
       "dev": true,
       "requires": {
-        "locate-path": "^3.0.0"
+        "locate-path": "^6.0.0",
+        "path-exists": "^4.0.0"
       }
     },
     "flat": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/flat/-/flat-4.1.0.tgz",
-      "integrity": "sha512-Px/TiLIznH7gEDlPXcUD4KnBusa6kR6ayRUVcnEAbreRIuhkqow/mun59BuRXwoYk7ZQOLW1ZM05ilIvK38hFw==",
-      "dev": true,
-      "requires": {
-        "is-buffer": "~2.0.3"
-      }
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/flat/-/flat-5.0.2.tgz",
+      "integrity": "sha512-b6suED+5/3rTpUBdG1gupIl8MPFCAMA0QXwmljLhvCUKcUvdE4gWky9zpuGCcXHOsz4J9wPGNWq6OKpmIzz3hQ==",
+      "dev": true
     },
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       "version": "2.0.1",
@@ -1018,18 +975,12 @@
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-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.1.2.tgz",
-      "integrity": "sha512-R4wDiBwZ0KzpgOWetKDug1FZcYhqYnUYKtfZYt4mD5SBz76q0KR4Q9o7GIPamsVPGmW3EYPPJ0dOOjvx32ldZA==",
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
       "dev": true,
       "optional": true
     },
-    "function-bind": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
-      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
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@@ -1098,27 +1049,12 @@
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-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
-      "integrity": "sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==",
-      "dev": true,
-      "requires": {
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-      }
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       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
       "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
       "dev": true
     },
-    "has-symbols": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.1.tgz",
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@@ -1224,24 +1160,6 @@
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-      "dev": true
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-      "version": "1.1.5",
-      "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.1.5.tgz",
-      "integrity": "sha512-ESKv5sMCJB2jnHTWZ3O5itG+O128Hsus4K4Qh1h2/cgn2vbgnLSVqfV46AeJA9D5EeeLa9w81KUXMtn34zhX+Q==",
-      "dev": true
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-    "is-date-object": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/is-date-object/-/is-date-object-1.0.2.tgz",
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@@ -1269,42 +1187,36 @@
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       "dev": true
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+    "is-plain-obj": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/is-plain-obj/-/is-plain-obj-2.1.0.tgz",
+      "integrity": "sha512-YWnfyRwxL/+SsrWYfOpUtz5b3YD+nyfkHvjbcanzk8zgyO4ASD67uVMRt8k5bM4lLMDnXfriRhOpemw+NfT1eA==",
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+    },
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-    "is-regex": {
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+      "integrity": "sha512-lY1Q/PiJGC2zOv/z391WOTD+Z02bCgsFfvxoXXf6h7kv9o+WmsmzYqrAwY63sNgOxE4xEdq0WyUnXfKeBrSvYw==",
       "dev": true
     },
     "pkg-dir": {
@@ -2213,13 +2186,22 @@
       "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
       "dev": true
     },
+    "randombytes": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz",
+      "integrity": "sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "^5.1.0"
+      }
+    },
     "readdirp": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.2.0.tgz",
-      "integrity": "sha512-crk4Qu3pmXwgxdSgGhgA/eXiJAPQiX4GMOZZMXnqKxHX7TaoL+3gQVo/WeuAiogr07DpnfjIMpXXa+PAIvwPGQ==",
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.5.0.tgz",
+      "integrity": "sha512-cMhu7c/8rdhkHXWsY+osBhfSy0JikwpHK/5+imo+LpeasTF8ouErHrlYkwT0++njiyuDvc7OFY5T3ukvZ8qmFQ==",
       "dev": true,
       "requires": {
-        "picomatch": "^2.0.4"
+        "picomatch": "^2.2.1"
       }
     },
     "regexpp": {
@@ -2283,6 +2265,24 @@
         "glob": "^7.1.3"
       }
     },
+    "rollup": {
+      "version": "2.52.3",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.52.3.tgz",
+      "integrity": "sha512-QF3Sju8Kl2z0osI4unyOLyUudyhOMK6G0AeqJWgfiyigqLAlnNrfBcDWDx+f1cqn+JU2iIYVkDrgQ6/KtwEfrg==",
+      "dev": true,
+      "requires": {
+        "fsevents": "~2.3.2"
+      },
+      "dependencies": {
+        "fsevents": {
+          "version": "2.3.2",
+          "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+          "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+          "dev": true,
+          "optional": true
+        }
+      }
+    },
     "run-async": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.3.0.tgz",
@@ -2319,6 +2319,15 @@
       "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
       "dev": true
     },
+    "serialize-javascript": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-5.0.1.tgz",
+      "integrity": "sha512-SaaNal9imEO737H2c05Og0/8LUXG7EnsZyMa8MzkmuHoELfT6txuj0cMqRj6zfPKnmQ1yasR4PCJc8x+M4JSPA==",
+      "dev": true,
+      "requires": {
+        "randombytes": "^2.1.0"
+      }
+    },
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
@@ -2471,26 +2480,6 @@
         }
       }
     },
-    "string.prototype.trimleft": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.1.tgz",
-      "integrity": "sha512-iu2AGd3PuP5Rp7x2kEZCrB2Nf41ehzh+goo8TV7z8/XDBbsvc6HQIlUl9RjkZ4oyrW1XM5UwlGl1oVEaDjg6Ag==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "function-bind": "^1.1.1"
-      }
-    },
-    "string.prototype.trimright": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.1.tgz",
-      "integrity": "sha512-qFvWL3/+QIgZXVmJBfpHmxLB7xsUXz6HsUmP8+5dRaC3Q7oKUv9Vo6aMCRZC1smrtyECFsIT30PqBJ1gTjAs+g==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "function-bind": "^1.1.1"
-      }
-    },
     "strip-ansi": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
@@ -2733,38 +2722,54 @@
       "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
       "dev": true
     },
+    "workerpool": {
+      "version": "6.1.4",
+      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.1.4.tgz",
+      "integrity": "sha512-jGWPzsUqzkow8HoAvqaPWTUPCrlPJaJ5tY8Iz7n1uCz3tTp6s3CDG0FF1NsX42WNlkRSW6Mr+CDZGnNoSsKa7g==",
+      "dev": true
+    },
     "wrap-ansi": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
-      "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
       "dev": true,
       "requires": {
-        "ansi-styles": "^3.2.0",
-        "string-width": "^3.0.0",
-        "strip-ansi": "^5.0.0"
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
       },
       "dependencies": {
-        "emoji-regex": {
-          "version": "7.0.3",
-          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
-          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
-          "dev": true
+        "ansi-styles": {
+          "version": "4.3.0",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+          "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+          "dev": true,
+          "requires": {
+            "color-convert": "^2.0.1"
+          }
         },
-        "is-fullwidth-code-point": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "dev": true,
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
           "dev": true
         },
-        "string-width": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
           "dev": true,
           "requires": {
-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
+            "ansi-regex": "^5.0.0"
           }
         }
       }
@@ -2803,68 +2808,65 @@
       "dev": true
     },
     "yargs": {
-      "version": "13.3.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
-      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
+      "version": "16.2.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",
+      "integrity": "sha512-D1mvvtDG0L5ft/jGWkLpG1+m0eQxOfaBvTNELraWj22wSVUMWxZUvYgJYcKh6jGGIkJFhH4IZPQhR4TKpc8mBw==",
       "dev": true,
       "requires": {
-        "cliui": "^5.0.0",
-        "find-up": "^3.0.0",
-        "get-caller-file": "^2.0.1",
+        "cliui": "^7.0.2",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
         "require-directory": "^2.1.1",
-        "require-main-filename": "^2.0.0",
-        "set-blocking": "^2.0.0",
-        "string-width": "^3.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.1"
+        "string-width": "^4.2.0",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^20.2.2"
       },
       "dependencies": {
-        "emoji-regex": {
-          "version": "7.0.3",
-          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
-          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
-          "dev": true
-        },
-        "is-fullwidth-code-point": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+        "y18n": {
+          "version": "5.0.8",
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+          "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
           "dev": true
-        },
-        "string-width": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
-          "dev": true,
-          "requires": {
-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
-          }
         }
       }
     },
     "yargs-parser": {
-      "version": "13.1.1",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
-      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
-      "dev": true,
-      "requires": {
-        "camelcase": "^5.0.0",
-        "decamelize": "^1.2.0"
-      }
+      "version": "20.2.4",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
+      "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA==",
+      "dev": true
     },
     "yargs-unparser": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
-      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-2.0.0.tgz",
+      "integrity": "sha512-7pRTIA9Qc1caZ0bZ6RYRGbHJthJWuakf+WmHK0rVeLkNrrGhfoabBNdue6kdINI6r4if7ocq9aD/n7xwKOdzOA==",
       "dev": true,
       "requires": {
-        "flat": "^4.1.0",
-        "lodash": "^4.17.15",
-        "yargs": "^13.3.0"
+        "camelcase": "^6.0.0",
+        "decamelize": "^4.0.0",
+        "flat": "^5.0.2",
+        "is-plain-obj": "^2.1.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "6.2.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.2.0.tgz",
+          "integrity": "sha512-c7wVvbw3f37nuobQNtgsgG9POC9qMbNuMQmTCqZv23b6MIz0fcYpBiOlv9gEN/hdLdnZTDQhg6e9Dq5M1vKvfg==",
+          "dev": true
+        },
+        "decamelize": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-4.0.0.tgz",
+          "integrity": "sha512-9iE1PgSik9HeIIw2JO94IidnE3eBoQrFJ3w7sFuzSX4DpmZ3v5sZpUiV5Swcf6mQEF+Y0ru8Neo+p+nyh2J+hQ==",
+          "dev": true
+        }
       }
+    },
+    "yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index 51acb09..47239c4 100644
--- a/package.json
+++ b/package.json
@@ -21,6 +21,7 @@
   "license": "(BSD-2-Clause OR WTFPL)",
   "repository": "domenic/sinon-chai",
   "main": "./lib/sinon-chai.js",
+  "module": "./lib/sinon-chai.mjs",
   "files": [
     "lib"
   ],
@@ -28,7 +29,8 @@
     "test": "mocha",
     "test-travis": "npm install && npm install chai@$CHAI_VERSION && npm install sinon@$SINON_VERSION && npm test",
     "lint": "eslint .",
-    "cover": "nyc --reporter=html mocha && opener ./coverage/sinon-chai.js.html"
+    "cover": "nyc --reporter=html mocha && opener ./coverage/sinon-chai.js.html",
+    "prepublishOnly": "rollup -c"
   },
   "peerDependencies": {
     "chai": "^4.0.0",
@@ -37,9 +39,14 @@
   "devDependencies": {
     "chai": "^4.2.0",
     "eslint": "^6.8.0",
-    "mocha": "^7.0.1",
+    "mocha": "^9.0.1",
     "nyc": "^15.0.0",
     "opener": "^1.5.1",
+    "rollup": "^2.52.3",
     "sinon": "^9.0.0"
+  },
+  "exports": {
+    "import": "./lib/sinon-chai.mjs",
+    "require": "./lib/sinon-chai.js"
   }
 }
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..af028fd
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,22 @@
+function globalRegister() {
+    return {
+        name: "sinon-chai-global-register",
+        generateBundle(options, bundle) {
+            const chunk = bundle["sinon-chai.js"];
+            chunk.code = chunk.code.replace(/\(global.*global.sinonChai\s*=\s*factory\(\)\)/, "chai.use(factory())");
+        }
+
+    };
+}
+
+
+export default {
+    input: "lib/sinon-chai.mjs",
+    plugins: [globalRegister()],
+    output: {
+        file: "lib/sinon-chai.js",
+        format: "umd",
+        name: "sinonChai",
+        esModule: false
+    }
+};
diff --git a/test/.eslintrc.json b/test/.eslintrc.json
index 60ba7fb..6e261c8 100644
--- a/test/.eslintrc.json
+++ b/test/.eslintrc.json
@@ -3,6 +3,13 @@
   "env": {
     "mocha": true,
     "node": true
+  },  
+  "parserOptions": {
+    "ecmaVersion": 5,
+    "sourceType": "script",
+    "ecmaFeatures": {
+      "modules": false
+    }
   },
   "rules": {
     "no-unused-expressions": "off"
diff --git a/test/common.js b/test/common.js
index 80bec18..38b3c8d 100644
--- a/test/common.js
+++ b/test/common.js
@@ -1,10 +1,5 @@
 "use strict";
 
-var chai = require("chai");
-var sinonChai = require("../lib/sinon-chai");
-chai.use(sinonChai);
-chai.should();
-
 exports.swallow = function (thrower) {
     try {
         thrower();
diff --git a/test/setup.mjs b/test/setup.mjs
new file mode 100644
index 0000000..52d22ed
--- /dev/null
+++ b/test/setup.mjs
@@ -0,0 +1,4 @@
+import chai from "chai";
+import sinonChai from "../lib/sinon-chai.mjs";
+chai.use(sinonChai);
+chai.should();