diff --git a/.github/workflows/nix-build.yml b/.github/workflows/nix-build.yml
index d74b95a..5b6046f 100644
--- a/.github/workflows/nix-build.yml
+++ b/.github/workflows/nix-build.yml
@@ -1,4 +1,6 @@
 name: Nix Build and Cache
+permissions:
+  contents: read
 
 on:
   push: