diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index d20cddd..31f5849 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -18,7 +18,7 @@ jobs:
           fetch-depth: 0 # Nix Flakes doesn't work on shallow clones
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v20
+        uses: cachix/install-nix-action@v21
 
       - name: Build static site
         run: nix build
diff --git a/.github/workflows/linkcheck.yml b/.github/workflows/linkcheck.yml
index adee11f..f7ec11e 100644
--- a/.github/workflows/linkcheck.yml
+++ b/.github/workflows/linkcheck.yml
@@ -20,7 +20,7 @@ jobs:
           fetch-depth: 0 # Nix Flakes doesn't work on shallow clones
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v20
+        uses: cachix/install-nix-action@v21
 
       - name: Build static site
         run: nix build
diff --git a/.github/workflows/links.yml b/.github/workflows/links.yml
index 4a74251..73217b3 100644
--- a/.github/workflows/links.yml
+++ b/.github/workflows/links.yml
@@ -23,7 +23,7 @@ jobs:
           fetch-depth: 0 # Nix Flakes doesn't work on shallow clones
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v20
+        uses: cachix/install-nix-action@v21
 
       - name: Build static site
         run: nix build