diff --git a/package.json b/package.json
index be15618..cbe1f6c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,7 @@
 {
   "private": true,
   "devDependencies": {
+    "concurrently": "^6.0.2",
     "parcel": "1.12.3",
     "purescript": "^0.14.0",
     "spago": "^0.19.1"
@@ -9,6 +10,8 @@
     "build": "spago build",
     "test": "spago test",
     "serve": "parcel dev/index.html --open",
+    "start": "concurrently \"npm run serve\" \"npm run watch-build\"",
+    "watch-build": "spago build --watch",
     "build-prod": "mkdir -p prod && cp dev/index.html prod/ && rm -rf dist && spago bundle-app --to prod/index.js && parcel build prod/index.html"
   }
 }
diff --git a/spago.dhall b/spago.dhall
index b007060..36514cc 100644
--- a/spago.dhall
+++ b/spago.dhall
@@ -1,5 +1,5 @@
 { name = "halogen-project"
-, dependencies = [ "console", "effect", "halogen", "psci-support" ]
+, dependencies = [ "console", "effect", "halogen", "prelude", "psci-support" ]
 , packages = ./packages.dhall
 , sources = [ "src/**/*.purs", "test/**/*.purs" ]
 }