diff --git a/.github/workflows/lock.yml b/.github/workflows/lock.yml
index da2ca9f0..d40c4597 100644
--- a/.github/workflows/lock.yml
+++ b/.github/workflows/lock.yml
@@ -5,6 +5,13 @@ on:
   schedule:
     - cron: '25 2/3 * * *'
 
+
+# dessant/lock-threads locks closed issues, PRs and discussions.
+permissions:
+  issues: write
+  pull-requests: write
+  discussions: write
+
 jobs:
   lock:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/pr-any.yml b/.github/workflows/pr-any.yml
index 4b1b7295..4522ffb0 100644
--- a/.github/workflows/pr-any.yml
+++ b/.github/workflows/pr-any.yml
@@ -1,6 +1,11 @@
 name: PR
 on: [pull_request]
 
+
+# Read-only token: no step writes through GITHUB_TOKEN.
+permissions:
+  contents: read
+
 jobs:
   pr:
     strategy: