diff --git a/.github/workflows/android_ci.yml b/.github/workflows/android_ci.yml
index d50fd880b..4c984467a 100644
--- a/.github/workflows/android_ci.yml
+++ b/.github/workflows/android_ci.yml
@@ -9,6 +9,9 @@ on:
     paths-ignore:
       - '**.md'
 
+permissions:
+  contents: read
+
 jobs:
   android-compile:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3d554fd84..546bf3799 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,9 @@ name: Simple CI
 
 on: [pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   run-ci:
     name: Lint
diff --git a/.github/workflows/ios_ci.yml b/.github/workflows/ios_ci.yml
index 50d831411..23984c811 100644
--- a/.github/workflows/ios_ci.yml
+++ b/.github/workflows/ios_ci.yml
@@ -9,6 +9,10 @@ on:
     paths-ignore:
       - '**.md'
 
+permissions:
+  actions: write
+  contents: read
+
 jobs:
   ios-compile:
     runs-on: macos-latest