diff --git a/core/global.rbs b/core/global.rbs
new file mode 100644
index 0000000..f540751
--- /dev/null
+++ b/core/global.rbs
@@ -0,0 +1,4 @@
+RUBY_VERSION: string
+MRUBY_VERSION: string
+MRUBYC_VERSION: string
+RUBY_ENGINE: string
diff --git a/test/global.rb b/test/global.rb
new file mode 100644
index 0000000..ec08ecb
--- /dev/null
+++ b/test/global.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+# rubocop:disable Lint/Void
+
+RUBY_VERSION
+MRUBY_VERSION
+MRUBYC_VERSION
+RUBY_ENGINE
+
+# rubocop:enable all