diff --git a/.github/workflows/check-elixir-phoenix.yml b/.github/workflows/check-elixir-phoenix.yml
index 21d6cfb..27dd66e 100644
--- a/.github/workflows/check-elixir-phoenix.yml
+++ b/.github/workflows/check-elixir-phoenix.yml
@@ -17,7 +17,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
         with:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/check-elixir.yml b/.github/workflows/check-elixir.yml
index f6a1170..a557da4 100644
--- a/.github/workflows/check-elixir.yml
+++ b/.github/workflows/check-elixir.yml
@@ -17,7 +17,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
         with:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/check-flake-utils.yml b/.github/workflows/check-flake-utils.yml
index 2c716ef..0816dbc 100644
--- a/.github/workflows/check-flake-utils.yml
+++ b/.github/workflows/check-flake-utils.yml
@@ -17,7 +17,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         extra_nix_config: |
           access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/check-gleam.yml b/.github/workflows/check-gleam.yml
index b4025f2..84e31dd 100644
--- a/.github/workflows/check-gleam.yml
+++ b/.github/workflows/check-gleam.yml
@@ -17,7 +17,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
         with:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/check-minimal.yml b/.github/workflows/check-minimal.yml
index 1427c06..46db3f6 100644
--- a/.github/workflows/check-minimal.yml
+++ b/.github/workflows/check-minimal.yml
@@ -17,7 +17,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         extra_nix_config: |
           access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/check-node-typescript.yml b/.github/workflows/check-node-typescript.yml
index 23edbef..04db899 100644
--- a/.github/workflows/check-node-typescript.yml
+++ b/.github/workflows/check-node-typescript.yml
@@ -16,7 +16,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         extra_nix_config: |
           access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/check-ocaml.yml b/.github/workflows/check-ocaml.yml
index 21e45f8..b7439dd 100644
--- a/.github/workflows/check-ocaml.yml
+++ b/.github/workflows/check-ocaml.yml
@@ -17,7 +17,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
         with:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/check-pre-commit.yml b/.github/workflows/check-pre-commit.yml
index bf48795..ef413d9 100644
--- a/.github/workflows/check-pre-commit.yml
+++ b/.github/workflows/check-pre-commit.yml
@@ -17,7 +17,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
         with:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/check-rust.yml b/.github/workflows/check-rust.yml
index af2c319..903b60c 100644
--- a/.github/workflows/check-rust.yml
+++ b/.github/workflows/check-rust.yml
@@ -17,7 +17,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
         with:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/check-treefmt.yml b/.github/workflows/check-treefmt.yml
index 3cc64dd..25334f2 100644
--- a/.github/workflows/check-treefmt.yml
+++ b/.github/workflows/check-treefmt.yml
@@ -17,7 +17,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
         with:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 1b62922..36a5726 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -13,5 +13,5 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
       - run: nix flake check ./dev -L --override-input src path:.
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 585e446..8385286 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -16,7 +16,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         extra_nix_config: |
           access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}