diff --git a/.github/workflows/ci-nix.yml b/.github/workflows/ci-nix.yml
index 66a72d3..df8e134 100644
--- a/.github/workflows/ci-nix.yml
+++ b/.github/workflows/ci-nix.yml
@@ -25,7 +25,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@v4
+      - uses: DeterminateSystems/nix-installer-action@v5
       - uses: DeterminateSystems/magic-nix-cache-action@v2
       - run: nix flake check
       - run: nix develop --command echo 'This step should be done before any other "nix develop" steps because of measuring Nix build time'
diff --git a/.github/workflows/update-nixpkgs.yml b/.github/workflows/update-nixpkgs.yml
index 97e8b58..494d75a 100644
--- a/.github/workflows/update-nixpkgs.yml
+++ b/.github/workflows/update-nixpkgs.yml
@@ -45,7 +45,7 @@ jobs:
           # https://stackoverflow.com/a/65056108
           fetch-depth: 0
         if: (github.event.sender.login != 'kachick') && (github.event_name == 'pull_request')
-      - uses: DeterminateSystems/nix-installer-action@v4
+      - uses: DeterminateSystems/nix-installer-action@v5
       - uses: DeterminateSystems/magic-nix-cache-action@v2
       - name: Prepare Git
         run: |