diff --git a/.eslintrc.json b/.eslintrc.json
index 8d8d9cb..d4b83db 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,10 +1,10 @@
 {
   "parserOptions": {
-    "ecmaVersion": 5
+    "ecmaVersion": 6,
+    "sourceType": "module"
   },
   "extends": "eslint:recommended",
   "env": {
-    "commonjs": true,
     "browser": true
   },
   "globals": {
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 063845e..06ed895 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,10 +13,12 @@ jobs:
       - uses: actions/checkout@v2
 
       - uses: purescript-contrib/setup-purescript@main
+        with:
+          purescript: "unstable"
 
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
-          node-version: "10"
+          node-version: "14"
 
       - name: Install dependencies
         run: |
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c7974ea..bb4665e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ Notable changes to this project are documented in this file. The format is based
 ## [Unreleased]
 
 Breaking changes:
+- Migrate FFI to ES modules (#7 by @JordanMartinez)
 
 New features:
 
diff --git a/bower.json b/bower.json
index 0366d8d..d856e2b 100644
--- a/bower.json
+++ b/bower.json
@@ -15,12 +15,12 @@
     "package.json"
   ],
   "dependencies": {
-    "purescript-arraybuffer-types": "^3.0.0",
-    "purescript-effect": "^3.0.0",
-    "purescript-exceptions": "^5.0.0",
-    "purescript-nullable": "^5.0.0",
-    "purescript-prelude": "^5.0.0",
-    "purescript-tuples": "^6.0.0",
-    "purescript-web-promise": "https://github.com/purescript-web/purescript-web-promise.git#2.0.0"
+    "purescript-arraybuffer-types": "main",
+    "purescript-effect": "master",
+    "purescript-exceptions": "master",
+    "purescript-nullable": "main",
+    "purescript-prelude": "master",
+    "purescript-tuples": "master",
+    "purescript-web-promise": "https://github.com/purescript-web/purescript-web-promise.git#master"
   }
 }
diff --git a/package.json b/package.json
index 1c67b54..4ea39f9 100644
--- a/package.json
+++ b/package.json
@@ -6,8 +6,8 @@
   },
   "devDependencies": {
     "eslint": "^7.15.0",
-    "pulp": "^15.0.0",
-    "purescript-psa": "^0.8.0",
+    "pulp": "16.0.0-0",
+    "purescript-psa": "^0.8.2",
     "rimraf": "^3.0.2"
   }
 }
diff --git a/src/Web/Streams/QueuingStrategy.js b/src/Web/Streams/QueuingStrategy.js
index e22c02f..e64d3c6 100644
--- a/src/Web/Streams/QueuingStrategy.js
+++ b/src/Web/Streams/QueuingStrategy.js
@@ -1,19 +1,18 @@
-"use strict";
-
-exports.new = function(options) {
+const newImpl = function (options) {
   return function() {
     return new QueuingStrategy(options);
   };
 };
+export { newImpl as new };
 
-exports.byteLengthQueuingStrategy = function(options) {
+export function byteLengthQueuingStrategy(options) {
   return function() {
     return new ByteLengthQueuingStrategy(options);
   };
-};
+}
 
-exports.countQueuingStrategy = function(options) {
+export function countQueuingStrategy(options) {
   return function() {
     return new CountQueuingStrategy(options);
   };
-};
+}
diff --git a/src/Web/Streams/ReadableStream.js b/src/Web/Streams/ReadableStream.js
index 060ec06..feea2ab 100644
--- a/src/Web/Streams/ReadableStream.js
+++ b/src/Web/Streams/ReadableStream.js
@@ -1,28 +1,26 @@
-"use strict";
-
-exports._new = function(source, strategy) {
+export function _new(source, strategy) {
   return new ReadableStream(source, strategy);
-};
+}
 
-exports.cancel = function(stream) {
+export function cancel(stream) {
   return function() {
     return stream.cancel();
   };
-};
+}
 
-exports.locked = function(stream) {
+export function locked(stream) {
   return function() {
     return stream.locked;
   };
-};
+}
 
-exports.getReader = function(stream) {
+export function getReader(stream) {
   return function() {
     return stream.getReader();
   };
-};
+}
 
-exports._tee = function(tuple, stream) {
+export function _tee(tuple, stream) {
   var r = stream.tee();
   return tuple(r[0])(r[1]);
-};
+}
diff --git a/src/Web/Streams/ReadableStreamController.js b/src/Web/Streams/ReadableStreamController.js
index 3f66e4c..118adc0 100644
--- a/src/Web/Streams/ReadableStreamController.js
+++ b/src/Web/Streams/ReadableStreamController.js
@@ -1,29 +1,27 @@
-"use strict";
-
-exports.enqueue = function(chunk) {
+export function enqueue(chunk) {
   return function(controller) {
     return function() {
       return controller.enqueue(chunk);
     };
   };
-};
+}
 
-exports.close = function(controller) {
+export function close(controller) {
   return function() {
     return controller.close();
   };
-};
+}
 
-exports.error = function(error) {
+export function error(error) {
   return function(controller) {
     return function() {
       return controller.error(error);
     };
   };
-};
+}
 
-exports.desiredSize = function(controller) {
+export function desiredSize(controller) {
   return function() {
     return controller.desiredSize;
   };
-};
+}
diff --git a/src/Web/Streams/Reader.js b/src/Web/Streams/Reader.js
index f4360fa..5a86a2f 100644
--- a/src/Web/Streams/Reader.js
+++ b/src/Web/Streams/Reader.js
@@ -1,10 +1,8 @@
-"use strict";
-
-exports._read = function(nothing, just, reader) {
+export function _read(nothing, just, reader) {
   return reader.read().then(function(res) {
     if (res.done) {
       return nothing;
     }
     return just(res.value);
   });
-};
+}
diff --git a/src/Web/Streams/Source.js b/src/Web/Streams/Source.js
index 6c1a4cb..94cc7cb 100644
--- a/src/Web/Streams/Source.js
+++ b/src/Web/Streams/Source.js
@@ -1,6 +1,4 @@
-"use strict";
-
-exports._make = function(options) {
+export function _make(options) {
   var newOptions = {
     start: function(controller) {
       return options.start(controller)();
@@ -17,4 +15,4 @@ exports._make = function(options) {
     };
   }
   return newOptions;
-};
+}