diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 456d865..5ec8526 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ruby: ['3.0', '3.1', '3.2']
+        ruby: ['3.0', '3.1', '3.2', '3.3']
     name: test (Ruby ${{ matrix.ruby }} on ${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.ruby-version b/.ruby-version
index a3ec5a4..eb39e53 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.2
+3.3