diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..d49e465
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,16 @@
+version: 2
+updates:
+  # Covers .github/workflows/*.yml and the root composite action.yml.
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      actions:
+        patterns: ["*"]
+
+  # Runtime is stdlib-only; this watches the optional extras and any future pins.
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e7cca5b..3231624 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,9 @@ on:
     branches: [main]
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   gates:
     name: gates (py${{ matrix.python-version }})
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index baf2c63..9c56903 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -4,6 +4,9 @@ on:
   push:
     tags: ["v*"]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest