diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 69f9b372..07c21590 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,6 +9,10 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+  pull-requests: read
+
 jobs:
   build:
     name: 🧪 Test & lint
diff --git a/.github/workflows/initiate_release.yml b/.github/workflows/initiate_release.yml
index 5fee524a..09ffaff2 100644
--- a/.github/workflows/initiate_release.yml
+++ b/.github/workflows/initiate_release.yml
@@ -7,6 +7,10 @@ on:
         description: "The new version number with 'v' prefix. Example: v1.40.1"
         required: true
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   init_release:
     name: 🚀 Create release PR
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d1b7c266..35657ddf 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -6,6 +6,10 @@ on:
     branches:
       - master
 
+permissions:
+  contents: read
+  pull-requests: read
+
 jobs:
   Release:
     name: 🚀 Release
diff --git a/.github/workflows/reviewdog.yml b/.github/workflows/reviewdog.yml
index fc887632..a9c2dbef 100644
--- a/.github/workflows/reviewdog.yml
+++ b/.github/workflows/reviewdog.yml
@@ -6,6 +6,10 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+  pull-requests: read
+
 jobs:
   reviewdog:
     name: 🐶 Reviewdog
diff --git a/.github/workflows/scheduled_test.yml b/.github/workflows/scheduled_test.yml
index 4b9e5a31..8b97e0be 100644
--- a/.github/workflows/scheduled_test.yml
+++ b/.github/workflows/scheduled_test.yml
@@ -6,6 +6,10 @@ on:
     # Monday at 9:00 UTC
     - cron: "0 9 * * 1"
 
+permissions:
+  contents: read
+  pull-requests: write
+
 jobs:
   test:
     runs-on: ubuntu-latest