diff --git a/.github/workflows/cachix.yml b/.github/workflows/cachix.yml
index 88768ee9..a67ec928 100644
--- a/.github/workflows/cachix.yml
+++ b/.github/workflows/cachix.yml
@@ -25,12 +25,7 @@ jobs:
         name: Checkout
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v31.8.4
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            substituters = https://cache.nixos.org/ https://feel-co.cachix.org
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= feel-co.cachix.org-1:nwEFNnwZvtl4KKSH5LDg+/+K7bV0vcs6faMHAJ6xx0w=
+        uses: DeterminateSystems/nix-installer-action@main
 
       - uses: cachix/cachix-action@v16
         with:
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 78671a88..2413fb1c 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -18,12 +18,9 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@v31.8.4
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            substituters = https://cache.nixos.org/ https://feel-co.cachix.org
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= feel-co.cachix.org-1:nwEFNnwZvtl4KKSH5LDg+/+K7bV0vcs6faMHAJ6xx0w=
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
 
       - name: Check Flake
         run: nix flake check
@@ -37,12 +34,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v31.8.4
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            substituters = https://cache.nixos.org/ https://feel-co.cachix.org
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= feel-co.cachix.org-1:nwEFNnwZvtl4KKSH5LDg+/+K7bV0vcs6faMHAJ6xx0w=
+        uses: DeterminateSystems/nix-installer-action@main
 
       - name: Check formatting via Alejandra
         run: nix run nixpkgs#alejandra -- --check . --exclude npins
@@ -91,14 +83,11 @@ jobs:
           - docs-manpages
           - docs-json
     steps:
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
       - name: Checkout
         uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@v31.8.4
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            substituters = https://cache.nixos.org/ https://feel-co.cachix.org
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= feel-co.cachix.org-1:nwEFNnwZvtl4KKSH5LDg+/+K7bV0vcs6faMHAJ6xx0w=
 
       - name: Set default git branch (to reduce log spam)
         run: git config --global init.defaultBranch main
@@ -122,14 +111,11 @@ jobs:
     runs-on: ubuntu-latest
     if: false # disabled until we fix ndg docs
     steps:
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
       - name: Checkout
         uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@v31.8.4
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            substituters = https://cache.nixos.org/ https://feel-co.cachix.org
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= feel-co.cachix.org-1:nwEFNnwZvtl4KKSH5LDg+/+K7bV0vcs6faMHAJ6xx0w=
 
       - name: Build linkcheck package
         run: nix build .#docs-linkcheck -Lv
@@ -162,12 +148,7 @@ jobs:
           cat "$HOME/changed_files"
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v31.8.4
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            substituters = https://cache.nixos.org/ https://feel-co.cachix.org
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= feel-co.cachix.org-1:nwEFNnwZvtl4KKSH5LDg+/+K7bV0vcs6faMHAJ6xx0w=
+        uses: DeterminateSystems/nix-installer-action@main
 
       - name: Checking Editorconfig conformance
         shell: bash
diff --git a/.github/workflows/docs-preview.yml b/.github/workflows/docs-preview.yml
index 74fd4b34..e33b5571 100644
--- a/.github/workflows/docs-preview.yml
+++ b/.github/workflows/docs-preview.yml
@@ -24,13 +24,11 @@ jobs:
   build-preview:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@v31.8.4
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            substituters = https://cache.nixos.org/ https://feel-co.cachix.org
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= feel-co.cachix.org-1:nwEFNnwZvtl4KKSH5LDg+/+K7bV0vcs6faMHAJ6xx0w=
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
+      - name: Checkout
+        uses: actions/checkout@v6
 
       - name: Set default git branch (to reduce log spam)
         run: git config --global init.defaultBranch main
diff --git a/.github/workflows/manual.yml b/.github/workflows/manual.yml
index 9a8b690f..b9505527 100644
--- a/.github/workflows/manual.yml
+++ b/.github/workflows/manual.yml
@@ -44,17 +44,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@v31.8.4
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            substituters = https://cache.nixos.org/ https://feel-co.cachix.org
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= feel-co.cachix.org-1:nwEFNnwZvtl4KKSH5LDg+/+K7bV0vcs6faMHAJ6xx0w=
-
+      - uses: DeterminateSystems/nix-installer-action@main
       - run: |
           nix build .#docs -Lv
           cp -r result/share/doc public
-
       - uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/release.json b/release.json
index c7151f55..1de9e327 100644
--- a/release.json
+++ b/release.json
@@ -1,4 +1,4 @@
 {
-  "release": "v0.9",
+  "release": "v0.8",
   "isReleaseBranch": false
 }