diff --git a/.github/workflows/ci-docs.yml b/.github/workflows/ci-docs.yml
index ddceac33..c9b62fd8 100644
--- a/.github/workflows/ci-docs.yml
+++ b/.github/workflows/ci-docs.yml
@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v4.1.5
         with:
           fetch-depth: 0
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@v27
       - name: Set current version
         run:  echo "DOCSPELL_VERSION=$(cat version.sbt | grep version | cut -d= -f2 | xargs)" >> $GITHUB_ENV
       - name: Build website (${{ env.DOCSPELL_VERSION }})
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 42316ae1..409b8620 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
           fetch-depth: 100
       - name: Fetch tags
         run: git fetch --depth=100 origin +refs/tags/*:refs/tags/*
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@v27
       - name: sbt ci ${{ github.ref }}
         run: nix develop .#ci --command sbt ci
   ci:
diff --git a/.github/workflows/release-nightly.yml b/.github/workflows/release-nightly.yml
index a4d951cd..620f9f1a 100644
--- a/.github/workflows/release-nightly.yml
+++ b/.github/workflows/release-nightly.yml
@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v4.1.5
         with:
           fetch-depth: 0
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@v27
       - name: Set current version
         run:  echo "DOCSPELL_VERSION=$(cat version.sbt | grep version | cut -d= -f2 | xargs)" >> $GITHUB_ENV
       - name: sbt ci ${{ github.ref }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 54b6fe1b..e9a9d45c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v4.1.5
         with:
           fetch-depth: 0
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@v27
       - name: Set current version
         run:  echo "DOCSPELL_VERSION=$(cat version.sbt | grep version | cut -d= -f2 | xargs)" >> $GITHUB_ENV
       - name: sbt make-pkg (${{ env.DOCSPELL_VERSION }})
diff --git a/.github/workflows/website.yml b/.github/workflows/website.yml
index 317c3cca..17105fb0 100644
--- a/.github/workflows/website.yml
+++ b/.github/workflows/website.yml
@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@v4.1.5
         with:
           fetch-depth: 0
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@v27
       - name: Set current version
         run:  echo "DOCSPELL_VERSION=$(cat version.sbt | grep version | cut -d= -f2 | xargs)" >> $GITHUB_ENV
       - name: Build website (${{ env.DOCSPELL_VERSION }})