diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2d28510..50d9084 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,7 @@ jobs:
       - name: Set up a PureScript toolchain
         uses: purescript-contrib/setup-purescript@main
         with:
+          purescript: "unstable"
           purs-tidy: "latest"
 
       - name: Cache PureScript dependencies
@@ -38,8 +39,17 @@ jobs:
       - name: Build tests
         run: spago -x test.dhall build --no-install --purs-args '--censor-lib --strict'
 
-      - name: Run tests
-        run: spago -x test.dhall test --no-install
+#      - name: Run tests
+#        run: spago -x test.dhall test --no-install
 
       - name: Check formatting
         run: purs-tidy check src test
+
+      - name: Verify Bower & Pulp
+        run: |
+          npm install bower pulp@16.0.0-0
+          npx bower install
+          npx pulp build -- --censor-lib --strict
+          if [ -d "test" ]; then
+            npx pulp test
+          fi
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2b46cd..4068438 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,11 @@
 Notable changes to this project are documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
+## Unreleased
+
+Breaking Changes:
+- Migrate FFI to ES modules (#20 by @JordanMartinez)
+
 ## v6.0.2 2021-07-11
 
 Move quickcheck test dependencies to `test.dhall`.
diff --git a/bower.json b/bower.json
index f4c8a7b..47b5645 100644
--- a/bower.json
+++ b/bower.json
@@ -1,29 +1,29 @@
 {
-    "name": "purescript-uint",
-    "license": [
-        "MIT"
-    ],
-    "repository": {
-        "type": "git",
-        "url": "https://github.com/purescript-contrib/purescript-uint.git"
-    },
-    "ignore": [
-        "**/.*",
-        "node_modules",
-        "bower_components",
-        "output"
-    ],
-    "dependencies": {
-        "purescript-enums": "^v5.0.0",
-        "purescript-gen": "^v3.0.0",
-        "purescript-math": "^v3.0.0",
-        "purescript-maybe": "^v5.0.0",
-        "purescript-prelude": "^v5.0.0",
-        "purescript-psci-support": "^v5.0.0"
-    },
-    "devDependencies": {
-        "purescript-effect": "^v3.0.0",
-        "purescript-quickcheck": "^v7.1.0",
-        "purescript-quickcheck-laws": "^v6.0.1"
-    }
+  "name": "purescript-uint",
+  "license": [
+    "MIT"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/purescript-contrib/purescript-uint.git"
+  },
+  "ignore": [
+    "**/.*",
+    "node_modules",
+    "bower_components",
+    "output"
+  ],
+  "dependencies": {
+    "purescript-enums": "master",
+    "purescript-gen": "master",
+    "purescript-math": "master",
+    "purescript-maybe": "master",
+    "purescript-prelude": "master"
+  },
+  "devDependencies": {
+    "purescript-effect": "master",
+    "purescript-psci-support": "master",
+    "purescript-quickcheck": "master",
+    "purescript-quickcheck-laws": "main"
+  }
 }
diff --git a/packages.dhall b/packages.dhall
index 2a73f20..582d6d3 100644
--- a/packages.dhall
+++ b/packages.dhall
@@ -1,126 +1,4 @@
-{-
-Welcome to your new Dhall package-set!
-
-Below are instructions for how to edit this file for most use
-cases, so that you don't need to know Dhall to use it.
-
-## Warning: Don't Move This Top-Level Comment!
-
-Due to how `dhall format` currently works, this comment's
-instructions cannot appear near corresponding sections below
-because `dhall format` will delete the comment. However,
-it will not delete a top-level comment like this one.
-
-## Use Cases
-
-Most will want to do one or both of these options:
-1. Override/Patch a package's dependency
-2. Add a package not already in the default package set
-
-This file will continue to work whether you use one or both options.
-Instructions for each option are explained below.
-
-### Overriding/Patching a package
-
-Purpose:
-- Change a package's dependency to a newer/older release than the
-    default package set's release
-- Use your own modified version of some dependency that may
-    include new API, changed API, removed API by
-    using your custom git repo of the library rather than
-    the package set's repo
-
-Syntax:
-Replace the overrides' "{=}" (an empty record) with the following idea
-The "//" or "⫽" means "merge these two records and
-  when they have the same value, use the one on the right:"
--------------------------------
-let overrides =
-  { packageName =
-      upstream.packageName // { updateEntity1 = "new value", updateEntity2 = "new value" }
-  , packageName =
-      upstream.packageName // { version = "v4.0.0" }
-  , packageName =
-      upstream.packageName // { repo = "https://www.example.com/path/to/new/repo.git" }
-  }
--------------------------------
-
-Example:
--------------------------------
-let overrides =
-  { halogen =
-      upstream.halogen // { version = "master" }
-  , halogen-vdom =
-      upstream.halogen-vdom // { version = "v4.0.0" }
-  }
--------------------------------
-
-### Additions
-
-Purpose:
-- Add packages that aren't already included in the default package set
-
-Syntax:
-Replace the additions' "{=}" (an empty record) with the following idea:
--------------------------------
-let additions =
-  { package-name =
-       { dependencies =
-           [ "dependency1"
-           , "dependency2"
-           ]
-       , repo =
-           "https://example.com/path/to/git/repo.git"
-       , version =
-           "tag ('v4.0.0') or branch ('master')"
-       }
-  , package-name =
-       { dependencies =
-           [ "dependency1"
-           , "dependency2"
-           ]
-       , repo =
-           "https://example.com/path/to/git/repo.git"
-       , version =
-           "tag ('v4.0.0') or branch ('master')"
-       }
-  , etc.
-  }
--------------------------------
-
-Example:
--------------------------------
-let additions =
-  { benchotron =
-      { dependencies =
-          [ "arrays"
-          , "exists"
-          , "profunctor"
-          , "strings"
-          , "quickcheck"
-          , "lcg"
-          , "transformers"
-          , "foldable-traversable"
-          , "exceptions"
-          , "node-fs"
-          , "node-buffer"
-          , "node-readline"
-          , "datetime"
-          , "now"
-          ]
-      , repo =
-          "https://github.com/hdgarrood/purescript-benchotron.git"
-      , version =
-          "v7.0.0"
-      }
-  }
--------------------------------
--}
 let upstream =
-      https://github.com/purescript/package-sets/releases/download/psc-0.14.3-20210722/packages.dhall sha256:1ceb43aa59436bf5601bac45f6f3781c4e1f0e4c2b8458105b018e5ed8c30f8c
-
-let overrides = {=}
-
-let additions = {=}
+      https://raw.githubusercontent.com/purescript/package-sets/prepare-0.15/src/packages.dhall
 
-in  upstream // overrides // additions
+in  upstream
diff --git a/spago.dhall b/spago.dhall
index 519f653..d9faab3 100644
--- a/spago.dhall
+++ b/spago.dhall
@@ -3,7 +3,6 @@
   [ "prelude"
   , "math"
   , "maybe"
-  , "psci-support"
   , "enums"
   , "gen"
   ]
diff --git a/src/Data/UInt.js b/src/Data/UInt.js
index ea027a6..db1269e 100644
--- a/src/Data/UInt.js
+++ b/src/Data/UInt.js
@@ -1,10 +1,8 @@
-"use strict";
-
-exports.from = function (val) {
+export function from(val) {
     return val >>> 0;
-};
+}
 
-exports.exact = function (just) {
+export function exact(just) {
     return function (nothing) {
         return function (conv) {
             return function (val) {
@@ -16,57 +14,57 @@ exports.exact = function (just) {
             };
         };
     };
-};
+}
 
-exports.toInt = function (uval) {
+export function toInt(uval) {
     return uval | 0;
-};
+}
 
-exports.toNumber = function (uval) {
+export function toNumber(uval) {
     return uval;
-};
+}
 
-exports.uintAdd = function (x) {
+export function uintAdd(x) {
     return function (y) {
         return (x + y) >>> 0;
     };
-};
+}
 
-exports.uintMul = function (x) {
+export function uintMul(x) {
     return function (y) {
         return Math.imul(x, y) >>> 0;
     };
-};
+}
 
-exports.uintSub = function (x) {
+export function uintSub(x) {
     return function (y) {
         return (x - y) >>> 0;
     };
-};
+}
 
-exports.uintDiv = function (x) {
+export function uintDiv(x) {
     return function (y) {
         return (x / y) >>> 0;
     };
-};
+}
 
-exports.uintMod = function (x) {
+export function uintMod(x) {
     return function (y) {
         return (x % y) >>> 0;
     };
-};
+}
 
-exports.uintDegree = function (x) {
+export function uintDegree(x) {
     return Math.abs(x | 0);
-};
+}
 
-exports.uintEq = function (x) {
+export function uintEq(x) {
     return function (y) {
         return x == y;
     };
-};
+}
 
-exports.uintCmp = function (lt) {
+export function uintCmp(lt) {
     return function (eq) {
         return function (gt) {
             return function (x) {
@@ -78,62 +76,62 @@ exports.uintCmp = function (lt) {
             };
         };
     };
-};
+}
 
-exports.fromStringImpl = function (s) {
+export function fromStringImpl(s) {
     var n = Number(s);
     if (n === parseInt(s)) {
         return n;
     }
     return NaN;
-};
+}
 
-exports.toString = function (x) {
+export function toString(x) {
     return x.toString();
-};
+}
 
-exports.pow = function (u) {
+export function pow(u) {
     return function (p) {
         return Math.pow(u, p) >>> 0;
     };
-};
+}
 
-exports.and = function (n1) {
+export function and(n1) {
     return function (n2) {
         return (n1 & n2) >>> 0;
     };
-};
+}
 
-exports.or = function (n1) {
+export function or(n1) {
     return function (n2) {
         return (n1 | n2) >>> 0;
     };
-};
+}
 
-exports.xor = function (n1) {
+export function xor(n1) {
     return function (n2) {
         return (n1 ^ n2) >>> 0;
     };
-};
+}
 
-exports.shl = function (n1) {
+export function shl(n1) {
     return function (n2) {
         return (n1 << n2) >>> 0;
     };
-};
+}
 
-exports.shr = function (n1) {
+export function shr(n1) {
     return function (n2) {
         return (n1 >> n2) >>> 0;
     };
-};
+}
 
-exports.zshr = function (n1) {
+export function zshr(n1) {
     return function (n2) {
         return (n1 >>> n2) >>> 0;
     };
-};
+}
 
-exports.complement = function (n) {
+export function complement(n) {
     return (~n >>> 0);
-};
+}