diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 5ae7ba7..69b8cbe 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -9,6 +9,9 @@
 env:
   BUILD_DEPS: bison flex g++ libboost-all-dev libevent-dev libssl-dev make cmake
 
+permissions:
+  contents: read
+
 jobs:
   compiler:
     runs-on: ubuntu-20.04