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 7fbb0b8..d232b3c 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 (#14 by @JordanMartinez)
 
 New features:
 
diff --git a/bower.json b/bower.json
index a0dba67..879edab 100644
--- a/bower.json
+++ b/bower.json
@@ -19,14 +19,14 @@
     "package-lock.json"
   ],
   "dependencies": {
-    "purescript-effect": "^3.0.0",
-    "purescript-partial": "^3.0.0",
-    "purescript-prelude": "^5.0.0",
-    "purescript-web-dom": "^5.0.0"
+    "purescript-effect": "master",
+    "purescript-partial": "master",
+    "purescript-prelude": "master",
+    "purescript-web-dom": "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 80a837e..00b713f 100644
--- a/package.json
+++ b/package.json
@@ -11,8 +11,8 @@
   },
   "devDependencies": {
     "parcel-bundler": "^1.12.3",
-    "pulp": "^15.0.0",
-    "purescript-psa": "^0.8.0",
+    "pulp": "16.0.0-0",
+    "purescript-psa": "^0.8.2",
     "rimraf": "^2.6.3"
   },
   "dependencies": {
diff --git a/src/Web/DOM/DOMParser.js b/src/Web/DOM/DOMParser.js
index f47f3fa..a911061 100644
--- a/src/Web/DOM/DOMParser.js
+++ b/src/Web/DOM/DOMParser.js
@@ -1,11 +1,9 @@
 /* Web.DOM.DOMParser */
-"use strict";
-
-exports.makeDOMParser = function () {
+export function makeDOMParser() {
   return new DOMParser();
-};
+}
 
-exports.parseFromString = function (documentType) {
+export function parseFromString(documentType) {
   return function (sourceString) {
     return function (domParser) {
       return function () { // Effect thunk
@@ -13,4 +11,4 @@ exports.parseFromString = function (documentType) {
       };
     };
   };
-};
+}
diff --git a/src/Web/DOM/XMLSerializer.js b/src/Web/DOM/XMLSerializer.js
index 59d5fd1..0425875 100644
--- a/src/Web/DOM/XMLSerializer.js
+++ b/src/Web/DOM/XMLSerializer.js
@@ -1,14 +1,12 @@
 /* Web.DOM.XMLSerializer */
-"use strict";
-
-exports.makeXMLSerializer = function () {
+export function makeXMLSerializer() {
   return new XMLSerializer();
-};
+}
 
-exports.serializeToString =  function (doc) {
+export function serializeToString(doc) {
   return function (xmlSerializer) {
     return function () { // Effect thunk
       return xmlSerializer.serializeToString(doc);
     };
   };
-};
+}
diff --git a/test/Main.purs b/test/Main.purs
index 2fc730f..a4040d9 100644
--- a/test/Main.purs
+++ b/test/Main.purs
@@ -2,18 +2,17 @@ module Test.Main where
 
 import Prelude
 
-import Data.Either (Either, fromRight, isLeft, isRight)
+import Data.Either (Either, either)
 import Data.Maybe (Maybe(..))
 import Effect (Effect)
 import Effect.Console (log)
-import Partial.Unsafe (unsafePartial)
+import Partial.Unsafe (unsafePartial, unsafeCrashWith)
 import Test.Data as TD
 
 import Web.DOM.Document (Document)
 import Web.DOM.DOMParser (DOMParser, makeDOMParser, parseFromString
                          , parseXMLFromString, _getParserError)
-import Web.DOM.XMLSerializer (XMLSerializer, makeXMLSerializer
-                             , serializeToString)
+import Web.DOM.XMLSerializer (XMLSerializer, makeXMLSerializer)
 
 parseNoteDocRaw :: DOMParser -> Effect Document
 parseNoteDocRaw = parseFromString "application/xml" TD.noteXml
@@ -42,12 +41,10 @@ main = do
     Nothing -> log "no parse error found for garbageOut"
     Just er -> log $ "Error is:" <> er
   log "test 2"
-  shouldBeRight <- parseNoteDoc domParser
-  log $ "is Right? " <> show (isRight shouldBeRight)
-  shouldBeLeft <- parseGarbage domParser
-  log $ "is Left? " <> show (isLeft shouldBeLeft)
+  shouldBeRight <- either (\_ -> unsafeCrashWith "should be right") identity <$> parseNoteDoc domParser
+  either (const unit) (\_ -> unsafeCrashWith "should be left") <$> parseGarbage domParser
   xmlSrlzr <- makeXMLSerializer
-  strFromNote <- unsafePartial $ serializeToString (fromRight shouldBeRight) xmlSrlzr
+  strFromNote <- unsafePartial $ serializeToString shouldBeRight xmlSrlzr
   log $ "serialization of note is:\n" <> strFromNote
 
   log "TODO: You should add some tests."