diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 274adb60..4627eb59 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v26
+        uses: cachix/install-nix-action@V27
 
       - name: Run formatter
         run: |
@@ -36,7 +36,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v26
+        uses: cachix/install-nix-action@V27
 
       - name: Setup cache
         uses: DeterminateSystems/magic-nix-cache-action@v6
diff --git a/.github/workflows/update-docs.yml b/.github/workflows/update-docs.yml
index adcb14f4..bf62f92a 100644
--- a/.github/workflows/update-docs.yml
+++ b/.github/workflows/update-docs.yml
@@ -21,7 +21,7 @@ jobs:
           token: ${{ secrets.PUSH_TOKEN }}
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v26
+        uses: cachix/install-nix-action@V27
 
       - name: Set Git user info
         run: |
diff --git a/.github/workflows/update-lock.yml b/.github/workflows/update-lock.yml
index 55cd16de..1391a887 100644
--- a/.github/workflows/update-lock.yml
+++ b/.github/workflows/update-lock.yml
@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v26
+        uses: cachix/install-nix-action@V27
 
       - name: Set Git user info
         run: |
diff --git a/.github/workflows/validate-sources.yml b/.github/workflows/validate-sources.yml
index a85ea803..44f42d6d 100644
--- a/.github/workflows/validate-sources.yml
+++ b/.github/workflows/validate-sources.yml
@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v26
+        uses: cachix/install-nix-action@V27
 
       - name: Run check
         run: |