diff --git a/.github/workflows/update-nix-assets-hash.yaml b/.github/workflows/update-nix-assets-hash.yaml
index df4c074e2..49f4105b0 100644
--- a/.github/workflows/update-nix-assets-hash.yaml
+++ b/.github/workflows/update-nix-assets-hash.yaml
@@ -19,6 +19,15 @@ jobs:
   update:
     runs-on: ubuntu-latest
     steps:
+      # Why?
+      #
+      # failed to
+      # $ nix build .#airi-pnpm-deps
+      # > airi-pnpm-deps> Running phase: fixupPhase
+      # > error: writing to file: No space left on device
+      - name: Free Disk Space
+        uses: jlumbroso/free-disk-space@main
+
       - uses: actions/checkout@v5
 
       - uses: cachix/install-nix-action@v31
diff --git a/.github/workflows/update-nix-pnpm-deps-hash.yaml b/.github/workflows/update-nix-pnpm-deps-hash.yaml
index afae6ee2d..45f102244 100644
--- a/.github/workflows/update-nix-pnpm-deps-hash.yaml
+++ b/.github/workflows/update-nix-pnpm-deps-hash.yaml
@@ -18,6 +18,15 @@ jobs:
   update:
     runs-on: ubuntu-latest
     steps:
+      # Why?
+      #
+      # failed to
+      # $ nix build .#airi-pnpm-deps
+      # > airi-pnpm-deps> Running phase: fixupPhase
+      # > error: writing to file: No space left on device
+      - name: Free Disk Space
+        uses: jlumbroso/free-disk-space@main
+
       - uses: actions/checkout@v5
 
       - uses: cachix/install-nix-action@v31