diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 517bc14f..2e0b1245 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -6,6 +6,8 @@ on:
 jobs:
   update:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - uses: actions/checkout@v3
       - uses: DeterminateSystems/magic-nix-cache-action@v2