diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 14048bb46..5d68e4138 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v22
+    - uses: cachix/install-nix-action@v26
       with:
         nix_path: nixpkgs=https://github.com/NixOS/nixpkgs/archive/d899609c2a22bbd345d2ed200c6ebc08a772ccc9.tar.gz
     - uses: cachix/cachix-action@v14
diff --git a/Guide/testing.markdown b/Guide/testing.markdown
index 78100d3af..0dfc7df5e 100644
--- a/Guide/testing.markdown
+++ b/Guide/testing.markdown
@@ -328,7 +328,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v20
+    - uses: cachix/install-nix-action@v26
       with:
         nix_path: nixpkgs=https://github.com/NixOS/nixpkgs/archive/51bcdc4cdaac48535dabf0ad4642a66774c609ed.tar.gz