diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f98038d..e6c7905 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
 
       - name: Flake checks
         run: nix flake check
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index b48f481..f9b23a0 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
 
       - name: publish to crates.io
         run: nix develop --command -- cargo publish