diff --git a/.github/workflows/xsugar-tests.yml b/.github/workflows/xsugar-tests.yml
index c9fc24e..08dd861 100644
--- a/.github/workflows/xsugar-tests.yml
+++ b/.github/workflows/xsugar-tests.yml
@@ -13,16 +13,13 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Install dependencies
       run: sudo apt-get update && sudo apt-get install -y libcurl4-openssl-dev openjdk-11-jdk-headless maven
     - name: Set up Ruby
-    # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
-    # change this to (see https://github.com/ruby/setup-ruby#versioning):
-    # uses: ruby/setup-ruby@v1
-      uses: ruby/setup-ruby@v1.76.0
+      uses: ruby/setup-ruby@v1
       with:
-        ruby-version: jruby-9.1.17.0
+        ruby-version: jruby-9.4.13.0
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
     - name: Run XSugar grammar tests
       run: bundle exec rake
diff --git a/.ruby-version b/.ruby-version
index 2b63f58..942c054 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-jruby-9.1.17.0
+jruby-9.4.13.0
diff --git a/Gemfile b/Gemfile
index d1e0ced..a3344cd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,3 +6,7 @@ gem 'json'
 gem 'progressbar'
 gem 'haml'
 gem 'httpclient'
+
+gem "test-unit", "~> 3.7"
+
+gem "rexml", "~> 3.4"
diff --git a/Gemfile.lock b/Gemfile.lock
index b6bcba1..ce98c59 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,10 +6,14 @@ GEM
       tilt
     httpclient (2.8.3)
     json (2.5.1-java)
+    power_assert (2.0.5)
     progressbar (0.21.0)
     rake (13.0.6)
     rdoc (6.2.0)
+    rexml (3.4.1)
     temple (0.8.2)
+    test-unit (3.7.0)
+      power_assert
     tilt (2.0.10)
 
 PLATFORMS
@@ -22,6 +26,8 @@ DEPENDENCIES
   progressbar
   rake
   rdoc
+  rexml (~> 3.4)
+  test-unit (~> 3.7)
 
 BUNDLED WITH
-   1.17.3
+   2.6.9