diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 93a4352f..b0dc9d87 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,4 +1,6 @@
 name: CI tests
+permissions:
+  contents: read
 on:
   push:
     branches:
diff --git a/.github/workflows/rubocop.yml b/.github/workflows/rubocop.yml
index 6204642c..c5a450de 100644
--- a/.github/workflows/rubocop.yml
+++ b/.github/workflows/rubocop.yml
@@ -3,6 +3,8 @@ on:
   pull_request:
     branches:
       - main
+permissions:
+  contents: read
 jobs:
   build:
     runs-on: ubuntu-latest