diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index d816316f6..8b263f80b 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -179,7 +179,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v17
+        uses: DeterminateSystems/nix-installer-action@v21
       - name: Nix Flake Check
         run: nix build .#checks.${{ matrix.target }}.${{ matrix.checks }} -L
   flake-build:
@@ -193,6 +193,6 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v17
+        uses: DeterminateSystems/nix-installer-action@v21
       - name: Nix Build
         run: nix build .#packages.${{ matrix.target }}.default -L