diff --git a/.eslintrc.json b/.eslintrc.json
index 84cef4f..1c6afb9 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,11 +1,9 @@
 {
   "parserOptions": {
-    "ecmaVersion": 5
+    "ecmaVersion": 6,
+    "sourceType": "module"
   },
   "extends": "eslint:recommended",
-  "env": {
-    "commonjs": true
-  },
   "rules": {
     "strict": [2, "global"],
     "block-scoped-var": 2,
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 43d2897..b6ebf3a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,6 +13,8 @@ jobs:
       - uses: actions/checkout@v2
 
       - uses: purescript-contrib/setup-purescript@main
+        with:
+          purescript: "unstable"
 
       - uses: actions/setup-node@v1
         with:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6b10ada..22d8f97 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 (#37 by @kl0tl and @JordanMartinez)
 
 New features:
 
diff --git a/bower.json b/bower.json
index 400e0c2..ec2cbf4 100644
--- a/bower.json
+++ b/bower.json
@@ -16,15 +16,15 @@
     "package.json"
   ],
   "dependencies": {
-    "purescript-foldable-traversable": "^5.0.0",
-    "purescript-maybe": "^5.0.0",
-    "purescript-partial": "^3.0.0",
-    "purescript-prelude": "^5.0.0",
-    "purescript-tuples": "^6.0.0"
+    "purescript-foldable-traversable": "master",
+    "purescript-maybe": "master",
+    "purescript-partial": "master",
+    "purescript-prelude": "master",
+    "purescript-tuples": "master"
   },
   "devDependencies": {
-    "purescript-assert": "^5.0.0",
-    "purescript-console": "^5.0.0",
-    "purescript-psci-support": "^5.0.0"
+    "purescript-assert": "master",
+    "purescript-console": "master",
+    "purescript-psci-support": "master"
   }
 }
diff --git a/package.json b/package.json
index fd4391e..a1d6811 100644
--- a/package.json
+++ b/package.json
@@ -7,8 +7,8 @@
   },
   "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/Data/Unfoldable.js b/src/Data/Unfoldable.js
index ba48300..9d9aa8e 100644
--- a/src/Data/Unfoldable.js
+++ b/src/Data/Unfoldable.js
@@ -1,6 +1,4 @@
-"use strict";
-
-exports.unfoldrArrayImpl = function (isNothing) {
+export const unfoldrArrayImpl = function (isNothing) {
   return function (fromJust) {
     return function (fst) {
       return function (snd) {
diff --git a/src/Data/Unfoldable1.js b/src/Data/Unfoldable1.js
index d794fdf..4993bd1 100644
--- a/src/Data/Unfoldable1.js
+++ b/src/Data/Unfoldable1.js
@@ -1,6 +1,4 @@
-"use strict";
-
-exports.unfoldr1ArrayImpl = function (isNothing) {
+export const unfoldr1ArrayImpl = function (isNothing) {
   return function (fromJust) {
     return function (fst) {
       return function (snd) {