diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index a108d4a..4568a4f 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: DeterminateSystems/nix-installer-action@v20
+      - uses: DeterminateSystems/nix-installer-action@v21
         with:
           extra-conf: |
             accept-flake-config = true
diff --git a/.github/workflows/update.yaml b/.github/workflows/update.yaml
index 3722066..56f4b17 100644
--- a/.github/workflows/update.yaml
+++ b/.github/workflows/update.yaml
@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - uses: fregante/setup-git-user@v2
-      - uses: DeterminateSystems/nix-installer-action@v20
+      - uses: DeterminateSystems/nix-installer-action@v21
         with:
           extra-conf: |
             accept-flake-config = true