diff --git a/.github/workflows/github_pages.yml b/.github/workflows/github_pages.yml
index 24eaafa2..7c5d7e91 100644
--- a/.github/workflows/github_pages.yml
+++ b/.github/workflows/github_pages.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v14
+    - uses: cachix/install-nix-action@v15
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - uses: cachix/cachix-action@v10
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 07d78e58..89b345fb 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v14.1
+    - uses: cachix/install-nix-action@v15
       with:
         install_url: https://releases.nixos.org/nix/nix-2.3.16/install
         nix_path: nixpkgs=channel:nixos-21.05