diff --git a/.github/workflows/nixpkgs-update.yml b/.github/workflows/nixpkgs-update.yml
index 1ec04ae..6fde703 100644
--- a/.github/workflows/nixpkgs-update.yml
+++ b/.github/workflows/nixpkgs-update.yml
@@ -47,6 +47,7 @@ jobs:
           repository: NixOS/nixpkgs
           ref: master
           fetch-depth: 0
+          persist-credentials: false
 
       - uses: DeterminateSystems/nix-installer-action@ef8a148080ab6020fd15196c2084a2eea5ff2d25 # v22