diff --git a/.github/workflows/nix-action-coq-8.16-macos.yml b/.github/workflows/nix-action-coq-8.16-macos.yml
index 636b93bb8..9e8b4b0c5 100644
--- a/.github/workflows/nix-action-coq-8.16-macos.yml
+++ b/.github/workflows/nix-action-coq-8.16-macos.yml
@@ -19,7 +19,7 @@ jobs:
         fetch-depth: 0
         ref: ${{ env.tested_commit }}
     - name: Cachix install
-      uses: cachix/install-nix-action@v25
+      uses: cachix/install-nix-action@V27
       with:
         nix_path: nixpkgs=channel:nixpkgs-unstable
     - name: Cachix setup metacoq
@@ -59,7 +59,7 @@ jobs:
         fetch-depth: 0
         ref: ${{ env.tested_commit }}
     - name: Cachix install
-      uses: cachix/install-nix-action@v25
+      uses: cachix/install-nix-action@V27
       with:
         nix_path: nixpkgs=channel:nixpkgs-unstable
     - name: Cachix setup metacoq
@@ -104,7 +104,7 @@ jobs:
         fetch-depth: 0
         ref: ${{ env.tested_commit }}
     - name: Cachix install
-      uses: cachix/install-nix-action@v25
+      uses: cachix/install-nix-action@V27
       with:
         nix_path: nixpkgs=channel:nixpkgs-unstable
     - name: Cachix setup metacoq
diff --git a/.github/workflows/nix-action-coq-8.16-ubuntu.yml b/.github/workflows/nix-action-coq-8.16-ubuntu.yml
index f633398ef..7b301a177 100644
--- a/.github/workflows/nix-action-coq-8.16-ubuntu.yml
+++ b/.github/workflows/nix-action-coq-8.16-ubuntu.yml
@@ -19,7 +19,7 @@ jobs:
         fetch-depth: 0
         ref: ${{ env.tested_commit }}
     - name: Cachix install
-      uses: cachix/install-nix-action@v25
+      uses: cachix/install-nix-action@V27
       with:
         nix_path: nixpkgs=channel:nixpkgs-unstable
     - name: Cachix setup metacoq
@@ -59,7 +59,7 @@ jobs:
         fetch-depth: 0
         ref: ${{ env.tested_commit }}
     - name: Cachix install
-      uses: cachix/install-nix-action@v25
+      uses: cachix/install-nix-action@V27
       with:
         nix_path: nixpkgs=channel:nixpkgs-unstable
     - name: Cachix setup metacoq
@@ -104,7 +104,7 @@ jobs:
         fetch-depth: 0
         ref: ${{ env.tested_commit }}
     - name: Cachix install
-      uses: cachix/install-nix-action@v25
+      uses: cachix/install-nix-action@V27
       with:
         nix_path: nixpkgs=channel:nixpkgs-unstable
     - name: Cachix setup metacoq