diff --git a/.version-determinate b/.version-determinate
index f02113fe87c..c3df54c9b83 100644
--- a/.version-determinate
+++ b/.version-determinate
@@ -1 +1 @@
-3.15.0
+3.15.1
diff --git a/doc/manual/source/SUMMARY.md.in b/doc/manual/source/SUMMARY.md.in
index 07324201fda..2684ec3d633 100644
--- a/doc/manual/source/SUMMARY.md.in
+++ b/doc/manual/source/SUMMARY.md.in
@@ -144,6 +144,7 @@
   - [Contributing](development/contributing.md)
 - [Determinate Nix Release Notes](release-notes-determinate/index.md)
   - [Changes between Nix and Determinate Nix](release-notes-determinate/changes.md)<!-- next -->
+  - [Release 3.15.1 (2025-12-24)](release-notes-determinate/v3.15.1.md)
   - [Release 3.15.0 (2025-12-19)](release-notes-determinate/v3.15.0.md)
   - [Release 3.14.0 (2025-12-08)](release-notes-determinate/v3.14.0.md)
   - [Release 3.13.2 (2025-11-19)](release-notes-determinate/v3.13.2.md)
diff --git a/doc/manual/source/release-notes-determinate/changes.md b/doc/manual/source/release-notes-determinate/changes.md
index 702060675d3..478068f2d89 100644
--- a/doc/manual/source/release-notes-determinate/changes.md
+++ b/doc/manual/source/release-notes-determinate/changes.md
@@ -1,6 +1,6 @@
 # Changes between Nix and Determinate Nix
 
-This section lists the differences between upstream Nix 2.33 and Determinate Nix 3.15.0.<!-- differences -->
+This section lists the differences between upstream Nix 2.33 and Determinate Nix 3.15.1.<!-- differences -->
 
 * In Determinate Nix, flakes are stable. You no longer need to enable the `flakes` experimental feature.
 
@@ -148,3 +148,9 @@ This section lists the differences between upstream Nix 2.33 and Determinate Nix
 * Determinate Nix has a builtin function `builtins.filterAttrs`. [DeterminateSystems/nix-src#291](https://github.com/DeterminateSystems/nix-src/pull/291)
 
 * `builtins.fetchTree` implicitly sets `__final = true` when a `narHash` is supplied. This allows the tree to be substituted. [DeterminateSystems/nix-src#297](https://github.com/DeterminateSystems/nix-src/pull/297)
+
+<!-- Determinate Nix version 3.15.1 -->
+
+* Bring back the free alpha by @grahamc in [DeterminateSystems/nix-src#305](https://github.com/DeterminateSystems/nix-src/pull/305)
+
+* Replace substitutable hashes with unlilkey to substitute hashes by @grahamc in [DeterminateSystems/nix-src#306](https://github.com/DeterminateSystems/nix-src/pull/306)
diff --git a/doc/manual/source/release-notes-determinate/v3.15.1.md b/doc/manual/source/release-notes-determinate/v3.15.1.md
new file mode 100644
index 00000000000..9243962cf4b
--- /dev/null
+++ b/doc/manual/source/release-notes-determinate/v3.15.1.md
@@ -0,0 +1,15 @@
+# Release 3.15.1 (2025-12-24)
+
+* Based on [upstream Nix 2.33.0](../release-notes/rl-2.33.md).
+
+## What's Changed
+Users reported the v3.15.0 tarball could not be fetched in a fixed-output derivation due to current stdenv paths present in the documentation. This release eliminated those paths.
+
+PR: [DeterminateSystems/nix-src#306](https://github.com/DeterminateSystems/nix-src/pull/306)
+
+Additionally, this change re-enables CodeRabbit's code review on our changes. CodeRabit was disabled by the upstream project, and we inadvertently included that change.
+
+PR: [DeterminateSystems/nix-src#305](https://github.com/DeterminateSystems/nix-src/pull/305)
+
+
+**Full Changelog**: [v3.15.0...v3.15.1](https://github.com/DeterminateSystems/nix-src/compare/v3.15.0...v3.15.1)