diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..27f4a0a
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,7 @@
+version: 2
+
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..5719083
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,28 @@
+name: Test dev container
+
+on:
+  schedule:
+    - cron: "56 5 * * *"
+  workflow_dispatch:
+
+jobs:
+  dev-container:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Test dev container
+        uses: devcontainers/ci@a56d055efecd725e8cfe370543b6071b79989cc8 # v0.3.1900000349
+        with:
+          runCmd: opensafely run run_all
+
+      - name: Notify Slack on failure
+        if: failure() && github.event_name == 'schedule'
+        uses: zuplo/github-action-slack-notify-build@cf8e7e66a21d76a8125ea9648979c30920195552 # v2
+        env:
+          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
+        with:
+          channel_id: C069YDR4NCA
+          status: "Scheduled dev container test run failure"
+          color: danger