diff --git a/.github/workflows/basic-eval.yml b/.github/workflows/basic-eval.yml
index a0cd990ebc73..57dd0a90752f 100644
--- a/.github/workflows/basic-eval.yml
+++ b/.github/workflows/basic-eval.yml
@@ -19,7 +19,7 @@ jobs:
     # we don't limit this action to only NixOS repo since the checks are cheap and useful developer feedback
     steps:
     - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-    - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
+    - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
     - uses: cachix/cachix-action@18cf96c7c98e048e10a83abd92116114cd8504be # v14
       with:
         # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.
diff --git a/.github/workflows/check-by-name.yml b/.github/workflows/check-by-name.yml
index 94875e67b649..00a8cb5e878f 100644
--- a/.github/workflows/check-by-name.yml
+++ b/.github/workflows/check-by-name.yml
@@ -98,7 +98,7 @@ jobs:
           base=$(mktemp -d)
           git worktree add "$base" "$(git rev-parse HEAD^1)"
           echo "base=$base" >> "$GITHUB_ENV"
-      - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
+      - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
       - name: Fetching the pinned tool
         # Update the pinned version using pkgs/test/nixpkgs-check-by-name/scripts/update-pinned-tool.sh
         run: |
diff --git a/.github/workflows/check-maintainers-sorted.yaml b/.github/workflows/check-maintainers-sorted.yaml
index 074644153204..e42a7bfbfa4b 100644
--- a/.github/workflows/check-maintainers-sorted.yaml
+++ b/.github/workflows/check-maintainers-sorted.yaml
@@ -16,7 +16,7 @@ jobs:
         with:
           # pull_request_target checks out the base branch by default
           ref: refs/pull/${{ github.event.pull_request.number }}/merge
-      - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
+      - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
         with:
           # explicitly enable sandbox
           extra_nix_config: sandbox = true
diff --git a/.github/workflows/editorconfig.yml b/.github/workflows/editorconfig.yml
index 6b151d45be2a..5c7f1ea52eae 100644
--- a/.github/workflows/editorconfig.yml
+++ b/.github/workflows/editorconfig.yml
@@ -28,7 +28,7 @@ jobs:
       with:
         # pull_request_target checks out the base branch by default
         ref: refs/pull/${{ github.event.pull_request.number }}/merge
-    - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
+    - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
       with:
         # nixpkgs commit is pinned so that it doesn't break
         # editorconfig-checker 2.4.0
diff --git a/.github/workflows/manual-nixos.yml b/.github/workflows/manual-nixos.yml
index c9c2451a9df2..d3079a03450a 100644
--- a/.github/workflows/manual-nixos.yml
+++ b/.github/workflows/manual-nixos.yml
@@ -18,7 +18,7 @@ jobs:
         with:
           # pull_request_target checks out the base branch by default
           ref: refs/pull/${{ github.event.pull_request.number }}/merge
-      - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
+      - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
         with:
           # explicitly enable sandbox
           extra_nix_config: sandbox = true
diff --git a/.github/workflows/manual-nixpkgs.yml b/.github/workflows/manual-nixpkgs.yml
index d9a425a494ab..ac19743cdd60 100644
--- a/.github/workflows/manual-nixpkgs.yml
+++ b/.github/workflows/manual-nixpkgs.yml
@@ -19,7 +19,7 @@ jobs:
         with:
           # pull_request_target checks out the base branch by default
           ref: refs/pull/${{ github.event.pull_request.number }}/merge
-      - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
+      - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
         with:
           # explicitly enable sandbox
           extra_nix_config: sandbox = true
diff --git a/.github/workflows/nix-parse.yml b/.github/workflows/nix-parse.yml
index e625cca93c5c..35363cd8cee3 100644
--- a/.github/workflows/nix-parse.yml
+++ b/.github/workflows/nix-parse.yml
@@ -29,7 +29,7 @@ jobs:
         # pull_request_target checks out the base branch by default
         ref: refs/pull/${{ github.event.pull_request.number }}/merge
       if: ${{ env.CHANGED_FILES && env.CHANGED_FILES != '' }}
-    - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
+    - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
       with:
         nix_path: nixpkgs=channel:nixpkgs-unstable
     - name: Parse all changed or added nix files
diff --git a/.github/workflows/update-terraform-providers.yml b/.github/workflows/update-terraform-providers.yml
index 77486c722287..ffeb5cc87e5a 100644
--- a/.github/workflows/update-terraform-providers.yml
+++ b/.github/workflows/update-terraform-providers.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-      - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
+      - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
         with:
           nix_path: nixpkgs=channel:nixpkgs-unstable
       - name: setup