diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9c90db8..c50fed6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,5 +1,9 @@
 name: Tests
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '0 0 1 * *'
 jobs:
   test:
     strategy:
@@ -7,7 +11,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest]
         # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
-        ruby: [2.7, '3.0', 3.1, 3.2, head, truffleruby]
+        ruby: [2.7, '3.0', 3.1, 3.2, 3.3, head, truffleruby]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2