diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 956be14fe..f4b0a67be 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -84,7 +84,7 @@ jobs:
             }
       - name: Install Nix
         if: (success() && steps.check.outputs.cached != 'true')
-        uses: cachix/install-nix-action@v27
+        uses: cachix/install-nix-action@V28
         with:
           extra_nix_config: |
             accept-flake-config = true
diff --git a/.github/workflows/document.yml b/.github/workflows/document.yml
index 873f22a0b..a3ed84159 100644
--- a/.github/workflows/document.yml
+++ b/.github/workflows/document.yml
@@ -23,7 +23,7 @@ jobs:
     steps:
       - name: Install Nix
         if: steps.check.outputs.cached != 'true'
-        uses: cachix/install-nix-action@v27
+        uses: cachix/install-nix-action@V28
         with:
           extra_nix_config: "accept-flake-config = true"
           install_url: https://releases.nixos.org/nix/nix-2.22.3/install
diff --git a/.github/workflows/flakehub-publish-rolling.yml b/.github/workflows/flakehub-publish-rolling.yml
index 0e3d91eb5..0f95c0eac 100644
--- a/.github/workflows/flakehub-publish-rolling.yml
+++ b/.github/workflows/flakehub-publish-rolling.yml
@@ -14,7 +14,7 @@ jobs:
       contents: "read"
     steps:
       - name: Install Nix
-        uses: cachix/install-nix-action@v27
+        uses: cachix/install-nix-action@V28
         with:
           extra_nix_config: |
             accept-flake-config = true
diff --git a/.github/workflows/full-bump.yml b/.github/workflows/full-bump.yml
index 64f19a600..96a1d085a 100644
--- a/.github/workflows/full-bump.yml
+++ b/.github/workflows/full-bump.yml
@@ -28,7 +28,7 @@ jobs:
     steps:
       # identical to build.yml
       - name: Install Nix
-        uses: cachix/install-nix-action@v27
+        uses: cachix/install-nix-action@V28
         with:
           extra_nix_config: |
             accept-flake-config = true
diff --git a/.github/workflows/needs-cache.yml b/.github/workflows/needs-cache.yml
index 73ff759bb..efc66ce7e 100644
--- a/.github/workflows/needs-cache.yml
+++ b/.github/workflows/needs-cache.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: nyxbuilder
     steps:
       - name: Install Nix
-        uses: cachix/install-nix-action@v27
+        uses: cachix/install-nix-action@V28
         with:
           extra_nix_config: |
             accept-flake-config = true
diff --git a/.github/workflows/nixpkgs-bump.yml b/.github/workflows/nixpkgs-bump.yml
index 475ec0291..e8a58a906 100644
--- a/.github/workflows/nixpkgs-bump.yml
+++ b/.github/workflows/nixpkgs-bump.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Nix
-        uses: cachix/install-nix-action@v27
+        uses: cachix/install-nix-action@V28
         with:
           extra_nix_config: |
             accept-flake-config = true
diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index 1be339b61..78def8549 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -14,7 +14,7 @@ jobs:
       fmt: ${{ steps.linter.outcome }}
     steps:
       - name: Install Nix
-        uses: cachix/install-nix-action@v27
+        uses: cachix/install-nix-action@V28
         with:
           extra_nix_config: |
             accept-flake-config = true
diff --git a/.github/workflows/single-bump.yml b/.github/workflows/single-bump.yml
index afe61114c..7ae7f1453 100644
--- a/.github/workflows/single-bump.yml
+++ b/.github/workflows/single-bump.yml
@@ -22,7 +22,7 @@ jobs:
     steps:
       # identical to build.yml
       - name: Install Nix
-        uses: cachix/install-nix-action@v27
+        uses: cachix/install-nix-action@V28
         with:
           extra_nix_config: |
             accept-flake-config = true
diff --git a/.github/workflows/wip-build.yml b/.github/workflows/wip-build.yml
index c6bcfde88..41021d2dc 100644
--- a/.github/workflows/wip-build.yml
+++ b/.github/workflows/wip-build.yml
@@ -25,7 +25,7 @@ jobs:
     steps:
       # identical to build.yml
       - name: Install Nix
-        uses: cachix/install-nix-action@v27
+        uses: cachix/install-nix-action@V28
         with:
           extra_nix_config: |
             accept-flake-config = true