diff --git a/.github/workflows/semgrep.yml b/.github/workflows/semgrep.yml
new file mode 100644
index 0000000..53b0772
--- /dev/null
+++ b/.github/workflows/semgrep.yml
@@ -0,0 +1,24 @@
+on:
+  workflow_dispatch: {}
+  pull_request: {}
+  push:
+    branches:
+    - main
+    - master
+    paths:
+    - .github/workflows/semgrep.yml
+  schedule:
+  # random HH:MM to avoid a load spike on GitHub Actions at 00:00
+  - cron: 31 16 * * *
+name: Semgrep
+jobs:
+  semgrep:
+    name: semgrep/ci
+    runs-on: ubuntu-20.04
+    env:
+      SEMGREP_APP_TOKEN: ${{ secrets.SEMGREP_APP_TOKEN }}
+    container:
+      image: returntocorp/semgrep
+    steps:
+    - uses: actions/checkout@v4
+    - run: semgrep ci