diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index ca0b37af6..07316c258 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v14
+    - uses: cachix/install-nix-action@v15
       with:
         nix_path: nixpkgs=channel:nixos-unstable
         extra_nix_config: |
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index f20218f96..4faa162b5 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -14,7 +14,7 @@ jobs:
     - uses: actions/checkout@v2
       with:
         fetch-depth: '0'
-    - uses: cachix/install-nix-action@v14
+    - uses: cachix/install-nix-action@v15
       with:
         nix_path: nixpkgs=channel:nixos-unstable
         extra_nix_config: |
@@ -28,7 +28,7 @@ jobs:
     needs: update_nur
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v14
+    - uses: cachix/install-nix-action@v15
       with:
         nix_path: nixpkgs=channel:nixos-unstable
         extra_nix_config: |