diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8583cecb..795a3205 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,9 @@ name: CI
 
 on: [ push, pull_request ]
 
+permissions:
+  contents: read
+
 jobs:
   linux:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/clang-tidy.yml b/.github/workflows/clang-tidy.yml
index bb221966..0ee02742 100644
--- a/.github/workflows/clang-tidy.yml
+++ b/.github/workflows/clang-tidy.yml
@@ -2,6 +2,9 @@ name: clang-tidy
 
 on: [ push, pull_request ]
 
+permissions:
+  contents: read
+
 jobs:
   clang-tidy:
     runs-on: ubuntu-latest