diff --git a/.github/workflows/ci-docs.yml b/.github/workflows/ci-docs.yml
index 6100a81b..ae32886a 100644
--- a/.github/workflows/ci-docs.yml
+++ b/.github/workflows/ci-docs.yml
@@ -16,7 +16,7 @@ jobs:
       - uses: jorelali/setup-elm@v5
         with:
           elm-version: 0.19.1
-      - uses: cachix/install-nix-action@v20
+      - uses: cachix/install-nix-action@v21
         with:
           nix_path: nixpkgs=channel:nixos-21.11
       - name: Print nixpkgs version
diff --git a/.github/workflows/website.yml b/.github/workflows/website.yml
index 8bee8167..dcdbc0d1 100644
--- a/.github/workflows/website.yml
+++ b/.github/workflows/website.yml
@@ -15,7 +15,7 @@ jobs:
       - uses: jorelali/setup-elm@v5
         with:
           elm-version: 0.19.1
-      - uses: cachix/install-nix-action@v20
+      - uses: cachix/install-nix-action@v21
         with:
           nix_path: nixpkgs=channel:nixos-21.11
       - name: Print nixpkgs version