diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 847182be1..766d64dce 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,6 +12,11 @@ on:
 
 env:
   BUILD_CACHE_KEY: ${{ github.sha }}-dist
+
+permissions:
+  contents: read
+  pull-requests: read
+
 jobs:
   lint:
     runs-on: ubuntu-latest
@@ -25,6 +30,9 @@ jobs:
 
   build:
     runs-on: ubuntu-latest
+    permissions:
+      actions: write
+      contents: read
     name: Build & Validate
     steps:
       - uses: actions/checkout@v6
diff --git a/.github/workflows/pr-check.yml b/.github/workflows/pr-check.yml
index 95c0aae2c..983c63872 100644
--- a/.github/workflows/pr-check.yml
+++ b/.github/workflows/pr-check.yml
@@ -4,6 +4,10 @@ on:
   pull_request:
     types: [opened, edited, synchronize, reopened]
 
+permissions:
+  contents: read
+  pull-requests: read
+
 jobs:
   pr-title:
     name: Validate PR Title
diff --git a/.github/workflows/size.yml b/.github/workflows/size.yml
index 6f593d79c..92ec10160 100644
--- a/.github/workflows/size.yml
+++ b/.github/workflows/size.yml
@@ -10,6 +10,10 @@ on:
 env:
   NODE_OPTIONS: --max_old_space_size=4096
 
+permissions:
+  contents: read
+  pull-requests: write
+
 jobs:
   compressed-size:
     name: Compressed Size