diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..2b3df9d
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,18 @@
+version: 2
+updates:
+  # One pull request a week for every Go dependency with an update, so that
+  # they are tested together.
+  - package-ecosystem: gomod
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      go-dependencies:
+        patterns: ["*"]
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      github-actions:
+        patterns: ["*"]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..d24d207
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,45 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Test (Go ${{ matrix.go }})
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    strategy:
+      fail-fast: false
+      matrix:
+        # The minimum go.mod allows, and the latest release.
+        go: [go.mod, stable]
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-go@v7
+        with:
+          go-version: ${{ matrix.go != 'go.mod' && matrix.go || '' }}
+          go-version-file: ${{ matrix.go == 'go.mod' && 'go.mod' || '' }}
+      - run: go vet ./...
+      - run: go test ./...
+
+  staticcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-go@v7
+        with:
+          go-version: stable
+      # The correctness checks only.
+      - run: go run honnef.co/go/tools/cmd/staticcheck@2026.2.1 -checks 'SA*' ./...
+
+  govulncheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: golang/govulncheck-action@v1
+        with:
+          go-version-input: stable
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
new file mode 100644
index 0000000..0d91086
--- /dev/null
+++ b/.github/workflows/codeql.yml
@@ -0,0 +1,26 @@
+name: CodeQL
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+  schedule:
+    - cron: '23 4 * * 1'
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-go@v7
+        with:
+          go-version: stable
+      - uses: github/codeql-action/init@v4
+        with:
+          languages: go
+          build-mode: autobuild
+      - uses: github/codeql-action/analyze@v4