diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6ce98f5..23500d5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,6 @@
 name: ESP32 Build & Quality Check
+permissions:
+  contents: read
 
 on:
   push: