diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 18a7d01..2a780ea 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: DeterminateSystems/nix-installer-action@v20
+      - uses: DeterminateSystems/nix-installer-action@v21
       - uses: DeterminateSystems/flakehub-cache-action@v2
       - run: nix build .#pam_spicedb .#pam_print
 
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: DeterminateSystems/nix-installer-action@v20
+      - uses: DeterminateSystems/nix-installer-action@v21
         env:
           NIX_INSTALLER_EXTRA_CONF: sandbox = false
       - uses: DeterminateSystems/flakehub-cache-action@v2