diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 9991414..ad05311 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -12,5 +12,5 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: DeterminateSystems/nix-installer-action@v20
+      - uses: DeterminateSystems/nix-installer-action@v21
       - run: nix flake check
diff --git a/.github/workflows/flake-update.yaml b/.github/workflows/flake-update.yaml
index a8ec89a..248582f 100644
--- a/.github/workflows/flake-update.yaml
+++ b/.github/workflows/flake-update.yaml
@@ -10,6 +10,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: DeterminateSystems/nix-installer-action@v20
+      - uses: DeterminateSystems/nix-installer-action@v21
       - uses: DeterminateSystems/update-flake-lock@v28
       - run: nix flake check