diff --git a/.travis.yml b/.travis.yml
index b593232e..d947aff1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,16 +1,24 @@
 sudo: required
 dist: trusty
-language: node_js
-node_js:
-  - "stable"
 branches:
   # Only build master and tagged versions, i.e. not feature branches; feature
   # branches already get built after opening a pull request.
   only:
     - master
     - /^v\d+\.\d+(\.\d+)?(-\S*)?$/
-before_install:
+language: node_js
+node_js:
+  - "stable"
+env:
+  - PATH=$HOME/bin:$PATH PURS_VERSION=v0.12.3 PSC_PACKAGE_VERSION=v0.5.1
+install:
+  - mkdir -p $HOME/bin
+  - wget -O $HOME/bin/purescript.tar.gz https://github.com/purescript/purescript/releases/download/$PURS_VERSION/linux64.tar.gz
+  - tar -xvf $HOME/bin/purescript.tar.gz -C $HOME/bin --strip-components 1 purescript/purs
+  - wget -O $HOME/bin/psc-package.tar.gz https://github.com/purescript/psc-package/releases/download/$PSC_PACKAGE_VERSION/linux64.tar.gz
+  - tar -xvf $HOME/bin/psc-package.tar.gz -C $HOME/bin --strip-components 1 psc-package/psc-package
+  - chmod -R a+x $HOME/bin
   - travis_retry npm install -g bower
-  - wget -q -O - https://github.com/purescript/psc-package/releases/download/v0.2.2/linux64.tar.gz | sudo tar xzf - -C /usr/local/bin --strip-components 1 psc-package/psc-package
 script:
+  - npm install
   - npm test
diff --git a/appveyor.yml b/appveyor.yml
index f7cd96c2..41c94539 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,6 +1,8 @@
 # Test against this version of Node.js
 environment:
   nodejs_version: "10"
+  purs_version: "v0.12.3"
+  psc_package_version: "v0.5.1"
 
 # Only build master and tagged versions, i.e. not feature branches; feature
 # branches already get built after opening a pull request.
@@ -23,14 +25,13 @@ cache:
 install:
   - ps: Install-Product node $env:nodejs_version x64
   - npm install -g bower
-  - npm install
   - set PATH=%PATH%;C:\tools
-  - pushd C:\tools & curl -opsc-package.tar.gz -L https://github.com/purescript/psc-package/releases/download/v0.2.2/win64.tar.gz & 7z e psc-package.tar.gz & 7z e psc-package.tar psc-package/psc-package.exe & popd
+  - pushd C:\tools & curl -opsc-package.tar.gz -L https://github.com/purescript/psc-package/releases/download/%psc_package_version%/win64.tar.gz & 7z e psc-package.tar.gz & 7z e psc-package.tar psc-package/psc-package.exe & popd
+  - pushd C:\tools & curl -opurescript.tar.gz -L https://github.com/purescript/purescript/releases/download/%purs_version%/win64.tar.gz & 7z e purescript.tar.gz & 7z e purescript.tar purescript/purs.exe & popd
 
 # Post-install test scripts.
 test_script:
-  - node --version
-  - npm --version
+  - npm install
   - npm run test
 
 # "build" means "build using the project or solution file", which we don't
diff --git a/package.json b/package.json
index 398a0913..eda75af3 100644
--- a/package.json
+++ b/package.json
@@ -33,14 +33,15 @@
   "engines": {
     "node": ">= 4"
   },
-  "config": {
-    "psc_build_version": "v0.12.1",
-    "psc_test_version": "v0.12.1"
-  },
   "scripts": {
-    "prepare": "node scripts.js prepare",
-    "test": "node scripts.js test",
-    "build": "node scripts.js build"
+    "prepare": "bower install && npm run build",
+    "test": "npm run test:unit && npm run test:integration",
+    "build": "npm run lint && npm run compile && npm run bundle",
+    "lint": "jshint src",
+    "compile": "psa -c \"src/**/*.purs\" \"test/**/*.purs\" \"bower_components/purescript-*/src/**/*.purs\" --censor-lib --censor-codes=ImplicitImport,HidingImport",
+    "bundle": "purs bundle \"output/*/*.js\" --output pulp.js --module Main --main Main",
+    "test:unit": "purs bundle \"output/*/*.js\" --output unit-tests.js --module Test.Main --main Test.Main && node unit-tests.js",
+    "test:integration": "mocha test-js --require babel/register"
   },
   "dependencies": {
     "browserify": "^16.2.3",
@@ -69,7 +70,6 @@
     "jshint": "^2.9.7",
     "mkdirp": "^0.5.1",
     "mocha": "^5.2.0",
-    "psvm": "^0.1.6",
     "purescript-psa": "^0.7.3",
     "semver": "^5.6.0",
     "touch": "^3.1.0"
diff --git a/scripts.js b/scripts.js
deleted file mode 100644
index d50b71eb..00000000
--- a/scripts.js
+++ /dev/null
@@ -1,127 +0,0 @@
-// Pulp build scripts
-//
-// Sometimes we need to use one version of the PureScript compiler to compile
-// Pulp with, and a different version to test with. For example, this is
-// usually necessary after a compiler release with breaking changes, because
-// the PureScript libraries which Pulp depends on will not yet have been
-// updated.
-//
-// This script enables us to switch versions of psc for different build
-// scripts, via psvm (https://github.com/ThomasCrvsr/psvm-js).
-const child_process = require("child_process");
-const mkdirp = require("mkdirp");
-const path = require("path");
-
-const scripts = {
-  "lint": "jshint src",
-  "compile": "psa -c \"src/**/*.purs\" \"test/**/*.purs\" \"bower_components/purescript-*/src/**/*.purs\" --censor-lib --censor-codes=ImplicitImport,HidingImport",
-  "bundle": "purs bundle \"output/*/*.js\" --output pulp.js --module Main --main Main",
-  "test:unit": "purs bundle \"output/*/*.js\" --output unit-tests.js --module Test.Main --main Test.Main && node unit-tests.js",
-  "test:integration": "mocha test-js --require babel/register"
-};
-
-const subcommand = process.argv[2];
-const restArgs = process.argv.slice(3);
-
-if (!subcommand) {
-  console.error("Expected a subcommand.");
-  console.error("Usage: ");
-  console.error("  node scripts.js [build|test|prepare]");
-  process.exit(1);
-}
-
-switch (subcommand) {
-  case "build":
-    build();
-    break;
-  case "test":
-    test();
-    break;
-  case "prepare":
-    prepare();
-    break;
-  default:
-    throw new Error("Unrecognised subcommand: " + subcommand);
-    break;
-}
-
-function build() {
-  spawnSync("psvm use " + getConfig("psc_build_version"));
-  ["lint", "compile", "bundle"].forEach(execScript);
-}
-
-function test() {
-  spawnSync("psvm use " + getConfig("psc_test_version"));
-  // TODO: unit tests don't work on Windows yet
-  if (process.platform !== "win32") {
-    execScript("test:unit");
-  }
-  execScript("test:integration");
-}
-
-function prepare() {
-  ensurePscVersionsInstalled();
-  spawnSync("bower install");
-  build();
-}
-
-// Construct and return an environment to run subcommands in.
-//
-// We set the PSVM_HOME environment variable to ensure that psvm only installs
-// stuff in the current directory.
-function getSubcommandEnv() {
-  var env = Object.assign({}, process.env);
-  env.PSVM_HOME = path.join(__dirname, ".psvm");
-  prependPath(env, path.join(env.PSVM_HOME, "current", "bin"));
-  return env;
-}
-
-function execScript(script) {
-  spawnSync(scripts[script] + " " + restArgs.join(" "));
-}
-
-
-function prependPath(env, newDirectory) {
-  const pathVar = process.platform === "win32" ? "Path" : "PATH";
-  env[pathVar] = newDirectory + path.delimiter + env[pathVar];
-}
-
-function ensurePscVersionsInstalled() {
-  var subcommandEnv = getSubcommandEnv();
-
-  const versions = ['psc_build_version', 'psc_test_version'].map(getConfig);
-
-  versions.forEach((version) => {
-    if (!subcommandEnv.GITHUB_API_TOKEN) {
-      console.error("Warning: GitHub API token not set.");
-    }
-    spawnSync("psvm install " + version);
-  });
-}
-
-function getConfig(variable) {
-  var result = process.env['npm_package_config_' + variable];
-  if (result) {
-    return result;
-  } else {
-    throw new Error("Missing configuration: " + variable);
-  }
-}
-
-function spawnSync(command, opts) {
-  opts = opts || {};
-  console.log(">> " + command);
-  var result = child_process.spawnSync(command, {
-    cwd: process.cwd(),
-    env: getSubcommandEnv(),
-    stdio: ["inherit", opts.quiet ? "pipe" : "inherit", "inherit"],
-    encoding: "utf-8",
-    shell: true
-  });
-
-  if (result.status !== 0) {
-    throw new Error("shell command exited with: " + result.status);
-  }
-
-  return result.stdout;
-}