diff --git a/.eslintrc.json b/.eslintrc.json
index 7f8e075..9d6a62b 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,7 +1,6 @@
 {
-  "env": { "commonjs": true },
   "extends": "eslint:recommended",
-  "parserOptions": { "ecmaVersion": 5 },
+  "parserOptions": { "ecmaVersion": 6, "sourceType": "module" },
   "rules": {
     "block-scoped-var": "error",
     "consistent-return": "error",
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 43f9f20..e16f413 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,7 @@ jobs:
       - name: Set up PureScript toolchain
         uses: purescript-contrib/setup-purescript@main
         with:
+          purescript: "unstable"
           purs-tidy: "latest"
 
       - name: Cache PureScript dependencies
@@ -49,8 +50,17 @@ jobs:
       - name: Build the project
         run: npm run build
 
-      - name: Run tests
-        run: npm run test
+#      - name: Run tests
+#        run: npm run test
 
       - 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 7770782..2bbf719 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ Notable changes to this project are documented in this file. The format is based
 ## [Unreleased]
 
 Breaking changes:
+- Migrate FFI to ES modules (#185 by @JordanMartinez)
+- Replaced polymorphic proxies with monomorphic `Proxy` (#185 by @JordanMartinez)
 
 New features:
 
diff --git a/bower.json b/bower.json
index b11275c..eddfbf3 100644
--- a/bower.json
+++ b/bower.json
@@ -17,15 +17,15 @@
     "url": "https://github.com/purescript-contrib/purescript-react.git"
   },
   "dependencies": {
-    "purescript-effect": "^3.0.0",
-    "purescript-exceptions": "^5.0.0",
-    "purescript-maybe": "^5.0.0",
-    "purescript-nullable": "^5.0.0",
-    "purescript-prelude": "^5.0.0",
-    "purescript-typelevel-prelude": "^6.0.0",
-    "purescript-unsafe-coerce": "^5.0.0"
+    "purescript-effect": "master",
+    "purescript-exceptions": "master",
+    "purescript-maybe": "master",
+    "purescript-nullable": "main",
+    "purescript-prelude": "master",
+    "purescript-typelevel-prelude": "master",
+    "purescript-unsafe-coerce": "master"
   },
   "devDependencies": {
-    "purescript-console": "^5.0.0"
+    "purescript-console": "master"
   }
 }
diff --git a/package.json b/package.json
index acf39bb..5617636 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,6 @@
   },
   "devDependencies": {
     "eslint": "^7.10.0",
-    "purescript-psa": "^0.8.0"
+    "purescript-psa": "^0.8.2"
   }
 }
diff --git a/packages.dhall b/packages.dhall
index 7a6905b..582d6d3 100644
--- a/packages.dhall
+++ b/packages.dhall
@@ -1,4 +1,4 @@
 let upstream =
-      https://github.com/purescript/package-sets/releases/download/psc-0.14.3-20210722/packages.dhall sha256:1ceb43aa59436bf5601bac45f6f3781c4e1f0e4c2b8458105b018e5ed8c30f8c
+      https://raw.githubusercontent.com/purescript/package-sets/prepare-0.15/src/packages.dhall
 
 in  upstream
diff --git a/spago.dhall b/spago.dhall
index 4e5b7a6..0119ab6 100644
--- a/spago.dhall
+++ b/spago.dhall
@@ -6,7 +6,6 @@
   , "maybe"
   , "nullable"
   , "prelude"
-  , "psci-support"
   , "typelevel-prelude"
   , "unsafe-coerce"
   ]
diff --git a/src/React.js b/src/React.js
index 91d4c45..b445652 100644
--- a/src/React.js
+++ b/src/React.js
@@ -1,43 +1,40 @@
-/* global exports */
-"use strict";
-
-var React = require("react");
+import React from "react";
 
 function createClass(baseClass) {
   function bindProperty(instance, prop, value) {
     switch (prop) {
-      case 'state':
-      case 'render':
-      case 'componentDidMount':
-      case 'componentWillUnmount':
+      case "state":
+      case "render":
+      case "componentDidMount":
+      case "componentWillUnmount":
         instance[prop] = value;
         break;
 
-      case 'componentDidCatch':
-      case 'componentWillUpdate':
-      case 'shouldComponentUpdate':
-      case 'getSnapshotBeforeUpdate':
+      case "componentDidCatch":
+      case "componentWillUpdate":
+      case "shouldComponentUpdate":
+      case "getSnapshotBeforeUpdate":
         instance[prop] = function (a, b) { return value(a)(b)(); };
         break;
 
-      case 'componentDidUpdate':
+      case "componentDidUpdate":
         instance[prop] = function (a, b, c) { return value(a)(b)(c)(); };
         break;
 
-      case 'unsafeComponentWillMount':
-        instance['UNSAFE_componentWillMount'] = value;
+      case "unsafeComponentWillMount":
+        instance["UNSAFE_componentWillMount"] = value;
         break;
 
-      case 'unsafeComponentWillReceiveProps':
-        instance['UNSAFE_componentWillReceiveProps'] = function (a) { return value(a)(); };
+      case "unsafeComponentWillReceiveProps":
+        instance["UNSAFE_componentWillReceiveProps"] = function (a) { return value(a)(); };
         break;
 
-      case 'unsafeComponentWillUpdate':
-        instance['UNSAFE_componentWillUpdate'] = function (a, b) { return value(a)(b)(); };
+      case "unsafeComponentWillUpdate":
+        instance["UNSAFE_componentWillUpdate"] = function (a, b) { return value(a)(b)(); };
         break;
 
       default:
-        throw new Error('[purescript-react] Not a component property: ' + prop);
+        throw new Error("[purescript-react] Not a component property: " + prop);
     }
   }
 
@@ -46,6 +43,7 @@ function createClass(baseClass) {
       var Constructor = function (props) {
         baseClass.call(this, props);
         var spec = ctrFn(this)();
+        // eslint-disable-next-line guard-for-in
         for (var k in spec) {
           bindProperty(this, k, spec[k]);
         }
@@ -60,6 +58,10 @@ function createClass(baseClass) {
   };
 }
 
+var componentImpl = createClass(React.Component);
+export {componentImpl};
+
+// eslint-disable-next-line no-unused-vars
 function createClassWithDerivedState(classCtr) {
   return function(displayName) {
     return function(getDerivedStateFromProps) {
@@ -72,28 +74,22 @@ function createClassWithDerivedState(classCtr) {
   };
 }
 
-var componentImpl = createClass(React.Component);
-exports.componentImpl = componentImpl;
-exports.componentWithDerivedStateImpl = createClassWithDerivedState(componentImpl);
+export const componentWithDerivedStateImpl = createClassWithDerivedState(componentImpl);
 
 var pureComponentImpl = createClass(React.PureComponent);
-exports.pureComponentImpl = pureComponentImpl;
-exports.pureComponentWithDerivedStateImpl = createClassWithDerivedState(pureComponentImpl);
-
-exports.statelessComponent = function(x) { return x; };
-
-exports.fragment = React.Fragment;
+export {pureComponentImpl};
+export const pureComponentWithDerivedStateImpl = createClassWithDerivedState(pureComponentImpl);
+export function statelessComponent(x) { return x; }
+export const fragment = React.Fragment;
 
 function getProps(this_) {
   return function(){
     return this_.props;
   };
 }
-exports.getProps = getProps;
-
-exports.childrenToArray = React.Children.toArray;
-
-exports.childrenCount = React.Children.count;
+export {getProps};
+export const childrenToArray = React.Children.toArray;
+export const childrenCount = React.Children.count;
 
 function setStateImpl(this_) {
   return function(state){
@@ -102,7 +98,7 @@ function setStateImpl(this_) {
     };
   };
 }
-exports.setStateImpl = setStateImpl;
+export {setStateImpl};
 
 function setStateWithCallbackImpl(this_) {
   return function(state){
@@ -113,17 +109,17 @@ function setStateWithCallbackImpl(this_) {
     };
   };
 }
-exports.setStateWithCallbackImpl = setStateWithCallbackImpl;
+export {setStateWithCallbackImpl};
 
 function getState(this_) {
   return function(){
     if (!this_.state) {
-      throw new Error('[purescript-react] Cannot get state within constructor');
+      throw new Error("[purescript-react] Cannot get state within constructor");
     }
     return this_.state;
   };
 }
-exports.getState = getState;
+export {getState};
 
 function forceUpdateWithCallback(this_) {
   return function(cb) {
@@ -132,7 +128,7 @@ function forceUpdateWithCallback(this_) {
     };
   };
 }
-exports.forceUpdateWithCallback = forceUpdateWithCallback;
+export {forceUpdateWithCallback};
 
 function createElement(class_) {
   return function(props){
@@ -141,15 +137,15 @@ function createElement(class_) {
     };
   };
 }
-exports.createElementImpl = createElement;
-exports.createElementTagName = createElement;
+export {createElement as createElementImpl};
+export {createElement as createElementTagName};
 
 function createLeafElement(class_) {
   return function(props) {
     return React.createElement(class_, props);
   };
 }
-exports.createLeafElementImpl = createLeafElement;
+export {createLeafElement as createLeafElementImpl};
 
 function createElementDynamic(class_) {
   return function(props) {
@@ -157,9 +153,9 @@ function createElementDynamic(class_) {
       return React.createElement(class_, props, children);
     };
   };
-};
-exports.createElementDynamicImpl = createElementDynamic;
-exports.createElementTagNameDynamic = createElementDynamic;
+}
+export {createElementDynamic as createElementDynamicImpl};
+export {createElementDynamic as createElementTagNameDynamic};
 
 function createContext(defaultValue) {
   var context = React.createContext(defaultValue);
@@ -168,4 +164,4 @@ function createContext(defaultValue) {
     provider: context.Provider
   };
 }
-exports.createContext = createContext;
+export {createContext};
diff --git a/src/React/DOM/Props.js b/src/React/DOM/Props.js
index 68e4a39..f82d507 100644
--- a/src/React/DOM/Props.js
+++ b/src/React/DOM/Props.js
@@ -1,8 +1,3 @@
-/* global exports */
-"use strict";
-
-var React = require("react");
-
 function unsafeMkProps(key) {
   return function(value){
     var result = {};
@@ -10,7 +5,7 @@ function unsafeMkProps(key) {
     return result;
   };
 }
-exports.unsafeMkProps = unsafeMkProps;
+export {unsafeMkProps};
 
 function unsafeUnfoldProps(key) {
   return function(value){
@@ -19,7 +14,7 @@ function unsafeUnfoldProps(key) {
     props[key] = result;
 
     for (var subprop in value) {
-      if (value.hasOwnProperty(subprop)) {
+      if (Object.hasOwnProperty.apply(value, [subprop])) {
         result[subprop] = value[subprop];
       }
     }
@@ -27,14 +22,14 @@ function unsafeUnfoldProps(key) {
     return props;
   };
 }
-exports.unsafeUnfoldProps = unsafeUnfoldProps;
+export {unsafeUnfoldProps};
 
 function unsafePrefixProps(prefix) {
   return function(value){
     var result = {};
 
     for (var prop in value) {
-      if (value.hasOwnProperty(prop)) {
+      if (Object.hasOwnProperty.apply(value, [prop])) {
         result[prefix + prop] = value[prop];
       }
     }
@@ -42,7 +37,7 @@ function unsafePrefixProps(prefix) {
     return result;
   };
 }
-exports.unsafePrefixProps = unsafePrefixProps;
+export {unsafePrefixProps};
 
 function unsafeFromPropsArray(props) {
   var result = {};
@@ -51,12 +46,12 @@ function unsafeFromPropsArray(props) {
     var prop = props[i];
 
     for (var key in prop) {
-      if (prop.hasOwnProperty(key)) {
+      if (Object.hasOwnProperty.apply(prop, [key])) {
         result[key] = prop[key];
       }
     }
   }
 
   return result;
-};
-exports.unsafeFromPropsArray = unsafeFromPropsArray;
+}
+export {unsafeFromPropsArray};
diff --git a/src/React/Ref.js b/src/React/Ref.js
index a08fe02..865a9c6 100644
--- a/src/React/Ref.js
+++ b/src/React/Ref.js
@@ -1,13 +1,10 @@
-"use strict";
+import React from "react";
+export const createRef = React.createRef;
 
-var React = require("react");
-
-exports.createRef = React.createRef;
-
-exports.liftCallbackRef = function(ref) {
+export function liftCallbackRef(ref) {
   return { current: ref };
 }
 
-exports.getCurrentRef_ = function(ref) {
+export function getCurrentRef_(ref) {
   return ref.current;
 }
diff --git a/src/React/SyntheticEvent.js b/src/React/SyntheticEvent.js
index 6d39ee0..499161e 100644
--- a/src/React/SyntheticEvent.js
+++ b/src/React/SyntheticEvent.js
@@ -1,47 +1,45 @@
-'use strict';
-
-exports.preventDefault = function preventDefault(event) {
+export function preventDefault(event) {
   return function() {
     return event.preventDefault();
   };
-};
+}
 
-exports.isDefaultPrevented = function isDefaultPrevented(event) {
+export function isDefaultPrevented(event) {
   return function() {
     return event.isDefaultPrevented();
   };
-};
+}
 
-exports.stopPropagation = function stopPropagation(event) {
+export function stopPropagation(event) {
   return function() {
     return event.stopPropagation();
   };
-};
+}
 
-exports.isPropagationStopped = function isPropagationStopped(event) {
+export function isPropagationStopped(event) {
   return function() {
     return event.isPropagationStopped();
   };
-};
+}
 
-exports.persist = function persist(event) {
+export function persist(event) {
   return function() {
     return event.persist();
   };
-};
+}
 
-exports.getModifierState = function getModifierState(key) {
+export function getModifierState(key) {
   return function(event) {
     return function() {
       return event.getModifierState(key);
     };
   };
-};
+}
 
-exports.unsafeGet = function unsafeGet(key) {
+export function unsafeGet(key) {
   return function (event) {
     return function () {
       return event[key];
     };
   };
-};
+}
diff --git a/src/React/SyntheticEvent.purs b/src/React/SyntheticEvent.purs
index f4c97e0..4695065 100644
--- a/src/React/SyntheticEvent.purs
+++ b/src/React/SyntheticEvent.purs
@@ -391,10 +391,10 @@ foreign import getModifierState
   -> Effect Boolean
 
 get
-  :: forall l r s a proxy
+  :: forall l r s a
    . Row.Cons l a r s
   => IsSymbol l
-  => proxy l
+  => Proxy l
   -> SyntheticEvent_ s
   -> Effect a
 get l r = unsafeGet (reflectSymbol l) r