diff --git a/.github/workflows/cachix.yml b/.github/workflows/cachix.yml
index 63a0fd6f..88768ee9 100644
--- a/.github/workflows/cachix.yml
+++ b/.github/workflows/cachix.yml
@@ -25,7 +25,7 @@ jobs:
         name: Checkout
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v31.9.0
+        uses: cachix/install-nix-action@v31.8.4
         with:
           nix_path: nixpkgs=channel:nixos-unstable
           extra_nix_config: |
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 5583213e..78671a88 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -18,7 +18,7 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@v31.9.0
+      - uses: cachix/install-nix-action@v31.8.4
         with:
           nix_path: nixpkgs=channel:nixos-unstable
           extra_nix_config: |
@@ -37,7 +37,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v31.9.0
+        uses: cachix/install-nix-action@v31.8.4
         with:
           nix_path: nixpkgs=channel:nixos-unstable
           extra_nix_config: |
@@ -93,7 +93,7 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@v31.9.0
+      - uses: cachix/install-nix-action@v31.8.4
         with:
           nix_path: nixpkgs=channel:nixos-unstable
           extra_nix_config: |
@@ -112,7 +112,7 @@ jobs:
         run: echo "date=$(date +'%Y-%m-%d-%H%M%S')" >> ${GITHUB_OUTPUT}
 
       - name: Upload doc artifacts
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v5
         with:
           name: "${{ matrix.package }}"
           path: result/share/doc/nvf
@@ -124,7 +124,7 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@v31.9.0
+      - uses: cachix/install-nix-action@v31.8.4
         with:
           nix_path: nixpkgs=channel:nixos-unstable
           extra_nix_config: |
@@ -162,7 +162,7 @@ jobs:
           cat "$HOME/changed_files"
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v31.9.0
+        uses: cachix/install-nix-action@v31.8.4
         with:
           nix_path: nixpkgs=channel:nixos-unstable
           extra_nix_config: |
diff --git a/.github/workflows/docs-preview.yml b/.github/workflows/docs-preview.yml
index 10421204..74fd4b34 100644
--- a/.github/workflows/docs-preview.yml
+++ b/.github/workflows/docs-preview.yml
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@v31.9.0
+      - uses: cachix/install-nix-action@v31.8.4
         with:
           nix_path: nixpkgs=channel:nixos-unstable
           extra_nix_config: |
diff --git a/.github/workflows/manual.yml b/.github/workflows/manual.yml
index 1c628b08..9a8b690f 100644
--- a/.github/workflows/manual.yml
+++ b/.github/workflows/manual.yml
@@ -44,7 +44,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@v31.9.0
+      - uses: cachix/install-nix-action@v31.8.4
         with:
           nix_path: nixpkgs=channel:nixos-unstable
           extra_nix_config: |