diff --git a/.github/workflows/monthly.yml b/.github/workflows/monthly.yml
index bb55c1df..1e304e7c 100644
--- a/.github/workflows/monthly.yml
+++ b/.github/workflows/monthly.yml
@@ -27,7 +27,7 @@ jobs:
       contents: read
     steps:
       - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@v8
+      - uses: DeterminateSystems/nix-installer-action@v9
       - uses: DeterminateSystems/flakehub-push@v3
         with:
           visibility: public