Release v3.21.5 (#73)

* Prepare release v3.21.5

* Update the state.json for v3.21.5

* Update README.md and action.yml for v3.21.5

* flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.1017464%2Brev-567a49d1913ce81ac6e9582e3553dd90a955875f/019ed27e-44b2-7462-b1ef-3564aa6c28ee/source.tar.gz' (2026-06-16)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.1027867%2Brev-d407951447dcd00442e97087bf374aad70c04cea/019f32d6-f801-7201-b6cb-59773d7eec95/source.tar.gz' (2026-07-05)

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

README.md

@@ -53,7 +53,7 @@ jobs:
       contents: read
     steps:
       - uses: actions/checkout@v7.0.0
-      - uses: DeterminateSystems/determinate-nix-action@main # or v3.21.2 to pin to a release
+      - uses: DeterminateSystems/determinate-nix-action@main # or v3.21.5 to pin to a release
       - run: nix build .
 ```
 
@@ -67,10 +67,10 @@ jobs:
 Unlike `DeterminateSystems/nix-installer-action`, we fully support explicit version pinning for maximum consistency.
 This Action is **automatically tagged** for every Determinate Nix release, giving you complete control over your CI environment:
 
-📍 Pinning to `DeterminateSystems/determinate-nix-action@v3.21.2` guarantees:
+📍 Pinning to `DeterminateSystems/determinate-nix-action@v3.21.5` guarantees:
 
 - Same `nix-installer-action` revision every time
-- Consistent Determinate Nix v3.21.2 installation
+- Consistent Determinate Nix v3.21.5 installation
 - Reproducible CI workflows, even years later
 
 ✨ Using `@main` instead? You'll:
@@ -113,7 +113,7 @@ updates:
 | `source-branch`           | The branch of `nix-installer` to use (conflicts with `source-tag`, `source-revision`, `source-pr`)                                                                                                                                                                             |          |                            |
 | `source-pr`               | The PR of `nix-installer` to use (conflicts with `source-tag`, `source-revision`, `source-branch`)                                                                                                                                                                             |          |                            |
 | `source-revision`         | The revision of `nix-installer` to use (conflicts with `source-tag`, `source-branch`, `source-pr`)                                                                                                                                                                             |          |                            |
-| `source-tag`              | The tag of `nix-installer` to use (conflicts with `source-revision`, `source-branch`, `source-pr`)                                                                                                                                                                             |          | `v3.21.2`                  |
+| `source-tag`              | The tag of `nix-installer` to use (conflicts with `source-revision`, `source-branch`, `source-pr`)                                                                                                                                                                             |          | `v3.21.5`                  |
 | `source-url`              | A URL pointing to a `nix-installer` executable                                                                                                                                                                                                                                 |          |                            |
 | `source-checksums-url`    | URL of a `shasum`-format checksums file listing the SHA-256 of each
 `nix-installer-<arch>-<os>` artifact. Used together with

action.yml

@@ -72,7 +72,7 @@
         "source-tag": {
             "description": "The tag of `nix-installer` to use (conflicts with `source-revision`, `source-branch`, `source-pr`)",
             "required": false,
-            "default": "v3.21.2"
+            "default": "v3.21.5"
         },
         "source-url": {
             "description": "A URL pointing to a `nix-installer` executable",

flake.lock

@@ -2,12 +2,12 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1781577229,
+        "lastModified": 1783224372,
-        "narHash": "sha256-lrp67w8AulE9Ks53n27I45ADSzbOCn4H+CNW1Ck8B+8=",
+        "narHash": "sha256-8i/87eeoqiGE4yOTjwSA3Eh/ziJRQEmd/unYU+K27sk=",
-        "rev": "567a49d1913ce81ac6e9582e3553dd90a955875f",
+        "rev": "d407951447dcd00442e97087bf374aad70c04cea",
-        "revCount": 1017464,
+        "revCount": 1027867,
         "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.1017464%2Brev-567a49d1913ce81ac6e9582e3553dd90a955875f/019ed27e-44b2-7462-b1ef-3564aa6c28ee/source.tar.gz"
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.1027867%2Brev-d407951447dcd00442e97087bf374aad70c04cea/019f32d6-f801-7201-b6cb-59773d7eec95/source.tar.gz"
       },
       "original": {
         "type": "tarball",

tools/state.json

@@ -1,5 +1,5 @@
 {
   "nix_installer_action_revision": "a7ad9c4f0c65208097f4d34f3cfa1913b80cce5c",
-  "determinate_nix_tag": "v3.21.2",
+  "determinate_nix_tag": "v3.21.5",
   "checkout_action_tag": "v7.0.0"
 }