diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5ee35a6..0c04c6b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -26,7 +26,7 @@ jobs:
 
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7
+          ruby-version: 3.3
 
       - name: Install Test Dependencies
         working-directory: test
diff --git a/test/.tool-versions b/test/.tool-versions
new file mode 100644
index 0000000..bfcd19f
--- /dev/null
+++ b/test/.tool-versions
@@ -0,0 +1,2 @@
+# for asdf or rtx
+ruby    3.3