diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2821c116..ead0edbb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
 
       - name: Install Nix
         if: ${{ matrix.use-nix }}
-        uses: DeterminateSystems/nix-installer-action@v20
+        uses: DeterminateSystems/nix-installer-action@v21
 
       - name: Setup Nix cache
         if: ${{ matrix.use-nix }}
@@ -55,7 +55,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v20
+        uses: DeterminateSystems/nix-installer-action@v21
 
       - name: Setup Nix cache
         uses: DeterminateSystems/magic-nix-cache-action@v13
diff --git a/.github/workflows/clippy.yml b/.github/workflows/clippy.yml
index f19dc006..3b0c5653 100644
--- a/.github/workflows/clippy.yml
+++ b/.github/workflows/clippy.yml
@@ -28,7 +28,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v20
+        uses: DeterminateSystems/nix-installer-action@v21
 
       - name: Setup Nix cache
         uses: DeterminateSystems/magic-nix-cache-action@v13
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index e54f909c..1d574cd9 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v20
+        uses: DeterminateSystems/nix-installer-action@v21
 
       - name: Setup Nix cache
         uses: DeterminateSystems/magic-nix-cache-action@v13
diff --git a/.github/workflows/update-flake.yml b/.github/workflows/update-flake.yml
index f38c824c..4c31ef4c 100644
--- a/.github/workflows/update-flake.yml
+++ b/.github/workflows/update-flake.yml
@@ -20,7 +20,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v20
+        uses: DeterminateSystems/nix-installer-action@v21
 
       - name: Update flake.lock
         id: update