diff --git a/README.md b/README.md
index b6b1a18..36a53de 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ jobs:
       contents: read
     steps:
       - uses: actions/checkout@v6.0.2
-      - uses: DeterminateSystems/determinate-nix-action@main # or v3.17.3 to pin to a release
+      - uses: DeterminateSystems/determinate-nix-action@main # or v3.17.2 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@v3.17.3` guarantees:
+📍 Pinning to `DeterminateSystems/determinate-nix-action@v3.17.2` guarantees:
 
 - Same `nix-installer-action` revision every time
-- Consistent Determinate Nix v3.17.3 installation
+- Consistent Determinate Nix v3.17.2 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`)                                                                                                                                                                             |          | `v3.17.3`                  |
+| `source-tag`            | The tag of `nix-installer` to use (conflicts with `source-revision`, `source-branch`, `source-pr`)                                                                                                                                                                             |          | `v3.17.2`                  |
 | `source-url`            | A URL pointing to a `nix-installer` executable                                                                                                                                                                                                                                 |          |                            |
 | `backtrace`             | The setting for `RUST_BACKTRACE` (see https://doc.rust-lang.org/std/backtrace/index.html#environment-variables)                                                                                                                                                                |          |                            |
 | `diagnostic-endpoint`   | Diagnostic endpoint url where the installer sends data to. To disable set this to an empty string.                                                                                                                                                                             |          | `-`                        |
diff --git a/action.yml b/action.yml
index c3c3d55..e1de883 100644
--- a/action.yml
+++ b/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": "v3.17.3"
+            "default": "v3.17.2"
         },
         "source-url": {
             "description": "A URL pointing to a `nix-installer` executable",
@@ -105,7 +105,7 @@
         "using": "composite",
         "steps": [
             {
-                "uses": "DeterminateSystems/nix-installer-action@b66b36319cc6fde4ea85edd583b088c65d6b8710",
+                "uses": "DeterminateSystems/nix-installer-action@490cfee336d5220c80b0c5cab117b4a26fb3898a",
                 "with": {
                     "extra-conf": "${{ inputs.extra-conf }}",
                     "github-server-url": "${{ inputs.github-server-url }}",
diff --git a/flake.lock b/flake.lock
index 523cd23..fe819e5 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,12 +2,12 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1775423009,
-        "narHash": "sha256-vPKLpjhIVWdDrfiUM8atW6YkIggCEKdSAlJPzzhkQlw=",
-        "rev": "68d8aa3d661f0e6bd5862291b5bb263b2a6595c9",
-        "revCount": 975402,
+        "lastModified": 1774709303,
+        "narHash": "sha256-D3Q07BbIA2KnTcSXIqqu9P586uWxN74zNoCH3h2ESHg=",
+        "rev": "8110df5ad7abf5d4c0f6fb0f8f978390e77f9685",
+        "revCount": 971119,
         "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.975402%2Brev-68d8aa3d661f0e6bd5862291b5bb263b2a6595c9/019d657b-b3b7-7288-b3c0-42d420df206b/source.tar.gz"
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.971119%2Brev-8110df5ad7abf5d4c0f6fb0f8f978390e77f9685/019d3c72-3e5d-7d8e-a4fc-0fe67ed1554b/source.tar.gz"
       },
       "original": {
         "type": "tarball",
diff --git a/tools/state.json b/tools/state.json
index 8084fa0..493ff58 100644
--- a/tools/state.json
+++ b/tools/state.json
@@ -1,5 +1,5 @@
 {
-  "nix_installer_action_revision": "b66b36319cc6fde4ea85edd583b088c65d6b8710",
-  "determinate_nix_tag": "v3.17.3",
+  "nix_installer_action_revision": "490cfee336d5220c80b0c5cab117b4a26fb3898a",
+  "determinate_nix_tag": "v3.17.2",
   "checkout_action_tag": "v6.0.2"
 }