diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 64a859e..7c153af 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,8 +16,6 @@ jobs:
         # Use various version syntaxes here for testing
         ruby: [ .ruby-version, 2.3, ruby-2.4, 2.5, ruby-2.6.5, 2.7.0, jruby, truffleruby ]
         exclude:
-        - os: windows-latest
-          ruby: jruby
         - os: windows-latest
           ruby: truffleruby
     runs-on: ${{ matrix.os }}
diff --git a/README.md b/README.md
index 57ed752..99ca580 100644
--- a/README.md
+++ b/README.md
@@ -29,8 +29,6 @@ The action works for all [GitHub-hosted runners](https://help.github.com/en/acti
 | macOS   | `macos-latest` |
 | Windows | `windows-latest` |
 
-JRuby and TruffleRuby are not yet supported on `windows-latest`.
-
 The prebuilt rubies are generated by [eregon/ruby-install-builder](https://github.com/eregon/ruby-install-builder)
 and on Windows by [RubyInstaller2](https://github.com/oneclick/rubyinstaller2).  
 The full list of available Ruby versions can be seen at [versions.json](https://github.com/eregon/ruby-install-builder/blob/metadata/versions.json)
diff --git a/dist/index.js b/dist/index.js
index 54f3e15..6010abf 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1386,14 +1386,15 @@ const core = __webpack_require__(470)
 async function run() {
   try {
     const platform = getVirtualEnvironmentName()
+    const [engine, version] = parseRubyEngineAndVersion(core.getInput('ruby-version'))
+
     let installer
-    if (platform === 'windows-latest') {
+    if (platform === 'windows-latest' && engine !== 'jruby') {
       installer = __webpack_require__(826)
     } else {
       installer = __webpack_require__(442)
     }
 
-    const [engine, version] = parseRubyEngineAndVersion(core.getInput('ruby-version'))
     const engineVersions = await installer.getAvailableVersions(engine)
     const ruby = validateRubyEngineAndVersion(platform, engineVersions, engine, version)
 
@@ -4847,6 +4848,8 @@ function escape(s) {
 __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "getAvailableVersions", function() { return getAvailableVersions; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "install", function() { return install; });
+const os = __webpack_require__(87)
+const path = __webpack_require__(622)
 const core = __webpack_require__(470)
 const io = __webpack_require__(1)
 const tc = __webpack_require__(533)
@@ -4864,12 +4867,12 @@ async function getAvailableVersions(engine) {
 
 async function install(platform, ruby) {
   const rubyPrefix = await downloadAndExtract(platform, ruby)
-  core.addPath(`${rubyPrefix}/bin`)
+  core.addPath(path.join(rubyPrefix, 'bin'))
   return rubyPrefix
 }
 
 async function downloadAndExtract(platform, ruby) {
-  const rubiesDir = `${process.env.HOME}/.rubies`
+  const rubiesDir = path.join(os.homedir(), '.rubies')
   await io.mkdirP(rubiesDir)
 
   const url = `${releasesURL}/download/${builderReleaseTag}/${ruby}-${platform}.tar.gz`
@@ -4878,7 +4881,7 @@ async function downloadAndExtract(platform, ruby) {
   const downloadPath = await tc.downloadTool(url)
   await tc.extractTar(downloadPath, rubiesDir)
 
-  return `${rubiesDir}/${ruby}`
+  return path.join(rubiesDir, ruby)
 }
 
 
diff --git a/index.js b/index.js
index 9e12fa2..bd890fe 100644
--- a/index.js
+++ b/index.js
@@ -5,14 +5,15 @@ const core = require('@actions/core')
 async function run() {
   try {
     const platform = getVirtualEnvironmentName()
+    const [engine, version] = parseRubyEngineAndVersion(core.getInput('ruby-version'))
+
     let installer
-    if (platform === 'windows-latest') {
+    if (platform === 'windows-latest' && engine !== 'jruby') {
       installer = require('./windows')
     } else {
       installer = require('./ruby-install-builder')
     }
 
-    const [engine, version] = parseRubyEngineAndVersion(core.getInput('ruby-version'))
     const engineVersions = await installer.getAvailableVersions(engine)
     const ruby = validateRubyEngineAndVersion(platform, engineVersions, engine, version)
 
diff --git a/ruby-install-builder.js b/ruby-install-builder.js
index d390f15..ac60a0c 100644
--- a/ruby-install-builder.js
+++ b/ruby-install-builder.js
@@ -1,3 +1,5 @@
+const os = require('os')
+const path = require('path')
 const core = require('@actions/core')
 const io = require('@actions/io')
 const tc = require('@actions/tool-cache')
@@ -15,12 +17,12 @@ export async function getAvailableVersions(engine) {
 
 export async function install(platform, ruby) {
   const rubyPrefix = await downloadAndExtract(platform, ruby)
-  core.addPath(`${rubyPrefix}/bin`)
+  core.addPath(path.join(rubyPrefix, 'bin'))
   return rubyPrefix
 }
 
 async function downloadAndExtract(platform, ruby) {
-  const rubiesDir = `${process.env.HOME}/.rubies`
+  const rubiesDir = path.join(os.homedir(), '.rubies')
   await io.mkdirP(rubiesDir)
 
   const url = `${releasesURL}/download/${builderReleaseTag}/${ruby}-${platform}.tar.gz`
@@ -29,5 +31,5 @@ async function downloadAndExtract(platform, ruby) {
   const downloadPath = await tc.downloadTool(url)
   await tc.extractTar(downloadPath, rubiesDir)
 
-  return `${rubiesDir}/${ruby}`
+  return path.join(rubiesDir, ruby)
 }