diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7a5ef34df..df80eb2b5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,9 @@ name: CI
 
 on: [push, pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   ci:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/stale.yml b/.github/workflows/stale.yml
index 6f5780c56..f2214a82e 100644
--- a/.github/workflows/stale.yml
+++ b/.github/workflows/stale.yml
@@ -4,8 +4,14 @@ on:
   - cron: "0 0 * * *"
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   stale:
+    permissions:
+      issues: write  # for actions/stale to close stale issues
+      pull-requests: write  # for actions/stale to close stale PRs
     runs-on: ubuntu-latest
     steps:
     - uses: actions/stale@v5
diff --git a/.github/workflows/update_deps.yml b/.github/workflows/update_deps.yml
index 1b61780a2..80e6e8026 100644
--- a/.github/workflows/update_deps.yml
+++ b/.github/workflows/update_deps.yml
@@ -4,8 +4,14 @@ on:
   schedule:
   - cron: "0 0 * * 0"
 
+permissions:
+  contents: read
+
 jobs:
   update_deps:
+    permissions:
+      contents: write  # for peter-evans/create-pull-request to create branch
+      pull-requests: write  # for peter-evans/create-pull-request to create a PR
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3