diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5ae52653..05f50c14 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,19 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: ["2.3", "2.4", "2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "head"]
+        ruby:
+          [
+            "2.3",
+            "2.4",
+            "2.5",
+            "2.6",
+            "2.7",
+            "3.0",
+            "3.1",
+            "3.2",
+            "3.3",
+            "head",
+          ]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Ruby