diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2f10157..a92976d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
           bun-version: "1.3.5"
       - uses: ruby/setup-ruby@90be1154f987f4dc0fe0dd0feedac9e473aa4ba8 # v1.286.0
         with:
-          ruby-version: "3.3"
+          ruby-version: "4.0.1"
       - run: gem install ruby-lsp
       - run: bun install
       - run: bun run build