diff --git a/.github/workflows/lock.yaml b/.github/workflows/lock.yaml
index b4f76338..647fe9dd 100644
--- a/.github/workflows/lock.yaml
+++ b/.github/workflows/lock.yaml
@@ -4,8 +4,14 @@ on:
   schedule:
     - cron: '0 0 * * *'
 
+permissions:
+  contents: read
+
 jobs:
   lock:
+    permissions:
+      issues: write  # for dessant/lock-threads to lock issues
+      pull-requests: write  # for dessant/lock-threads to lock PRs
     runs-on: ubuntu-latest
     steps:
       - uses: dessant/lock-threads@v3
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 7ad21db9..c3819956 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -16,6 +16,9 @@ on:
       - 'docs/**'
       - '*.md'
       - '*.rst'
+permissions:
+  contents: read
+
 jobs:
   tests:
     name: ${{ matrix.name }}