diff --git a/package-lock.json b/package-lock.json
index 6c35193..20266cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2,15 +2,11 @@
   "name": "jest-fetch-mock",
   "version": "1.5.0",
   "lockfileVersion": 1,
-  "requires": true,
   "dependencies": {
     "encoding": {
       "version": "0.1.12",
       "resolved": "https://registry.npmjs.org/encoding/-/encoding-0.1.12.tgz",
-      "integrity": "sha1-U4tm8+5izRq1HsMjgp0flIDHS+s=",
-      "requires": {
-        "iconv-lite": "0.4.19"
-      }
+      "integrity": "sha1-U4tm8+5izRq1HsMjgp0flIDHS+s="
     },
     "iconv-lite": {
       "version": "0.4.19",
@@ -25,20 +21,17 @@
     "isomorphic-fetch": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/isomorphic-fetch/-/isomorphic-fetch-2.2.1.tgz",
-      "integrity": "sha1-YRrhrPFPXoH3KVB0coGf6XM1WKk=",
-      "requires": {
-        "node-fetch": "1.7.3",
-        "whatwg-fetch": "2.0.3"
-      }
+      "integrity": "sha1-YRrhrPFPXoH3KVB0coGf6XM1WKk="
     },
     "node-fetch": {
       "version": "1.7.3",
       "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-1.7.3.tgz",
-      "integrity": "sha512-NhZ4CsKx7cYm2vSrBAr2PvFOe6sWDf0UYLRqA6svUYg7+/TSfVAu49jYC4BvQ4Sms9SZgdqGBgroqfDhJdTyKQ==",
-      "requires": {
-        "encoding": "0.1.12",
-        "is-stream": "1.1.0"
-      }
+      "integrity": "sha512-NhZ4CsKx7cYm2vSrBAr2PvFOe6sWDf0UYLRqA6svUYg7+/TSfVAu49jYC4BvQ4Sms9SZgdqGBgroqfDhJdTyKQ=="
+    },
+    "promise-polyfill": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/promise-polyfill/-/promise-polyfill-7.1.1.tgz",
+      "integrity": "sha512-k1ArwERleWt59+JZuPp5Asd4+Eo3R6g4SDWKl8ozLYZE6K5pZULl1e4hlg112OYVgQcJ6IwBlBHP6JkCDUrayA=="
     },
     "whatwg-fetch": {
       "version": "2.0.3",
diff --git a/package.json b/package.json
index 9a1c056..bf3c836 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,8 @@
   },
   "homepage": "https://github.com/jefflau/jest-fetch-mock#readme",
   "dependencies": {
-    "isomorphic-fetch": "^2.2.1"
+    "isomorphic-fetch": "^2.2.1",
+    "promise-polyfill": "^7.1.1"
   },
   "prettier": {
     "semi": false,
diff --git a/src/index.js b/src/index.js
index d893158..8321890 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,4 +1,5 @@
 require('isomorphic-fetch')
+const Promise = require('promise-polyfill');
 
 const ActualResponse = Response