diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3a8b2b79b3..191bc33bad 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,9 @@ name: Test
 
 on: [push, pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   test:
     strategy:
diff --git a/.github/workflows/mirror.yml b/.github/workflows/mirror.yml
index 048721bc2e..deed1a76d1 100644
--- a/.github/workflows/mirror.yml
+++ b/.github/workflows/mirror.yml
@@ -10,6 +10,9 @@ on:
         description: Git commit reference to start comparing from
         required: true
 
+permissions:
+  contents: read
+
 jobs:
   mirror:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ccda1b750a..9b2cef5f95 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -3,6 +3,9 @@ on:
   push:
     tags: 'v*'
 
+permissions:
+  contents: read
+
 jobs:
   homebrew:
     name: Bump Homebrew formula