diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1a11f0e9..5ed2322a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,6 +23,10 @@ jobs:
         os:
         - macos-latest
         - ubuntu-latest
+        - windows-latest
+        exclude:
+        - os: windows-latest
+          ruby: truffleruby-head
     runs-on: ${{ matrix.os }}
     timeout-minutes: 10
     env:
diff --git a/Rakefile b/Rakefile
index 59067f90..10c3076e 100644
--- a/Rakefile
+++ b/Rakefile
@@ -9,12 +9,19 @@ task default: %i[test rubocop]
 begin
   fork { nil }
 rescue NotImplementedError
-  # jruby and windows can't fork so use vanilla rake instead
+  # jruby, truffleruby, and windows can't fork so use vanilla rake instead
+  warn 'warn: fork is not implemented on this Ruby, falling back to vanilla rake'
   require 'rake/testtask'
+  Rake::TestTask.new do |t|
+    t.libs << 'test'
+    t.test_files = FileList['test/test_*.rb']
+    t.verbose = true
+  end
 else
   desc 'Run each test in isolation'
   task :test do
     sh 'forking-test-runner test/test_* --helper test/helper.rb --verbose'
   end
 end
+
 RuboCop::RakeTask.new
diff --git a/bin/ci b/bin/ci
index 074d299e..b4d09a5a 100755
--- a/bin/ci
+++ b/bin/ci
@@ -2,7 +2,8 @@
 
 set -e
 
-if [[ "$OSTYPE" == "darwin"* ]]; then
+echo $OSTYPE
+if [[ "$OSTYPE" != "linux-gnu" ]]; then
     bundle exec rake test
 else
     # Sometimes minitest starts and then just hangs printing nothing.