diff --git a/doc/manual/source/SUMMARY.md.in b/doc/manual/source/SUMMARY.md.in
index 00f231a6a..391a9ec93 100644
--- a/doc/manual/source/SUMMARY.md.in
+++ b/doc/manual/source/SUMMARY.md.in
@@ -130,6 +130,7 @@
   - [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 3.8.0 (2025-07-10)](release-notes-determinate/rl-3.8.0.md)
   - [Release 3.7.0 (2025-07-03)](release-notes-determinate/rl-3.7.0.md)
   - [Release 3.6.8 (2025-06-25)](release-notes-determinate/rl-3.6.8.md)
   - [Release 3.6.7 (2025-06-24)](release-notes-determinate/rl-3.6.7.md)
diff --git a/doc/manual/source/release-notes-determinate/changes.md b/doc/manual/source/release-notes-determinate/changes.md
index 0d4b2b1ad..c231e140e 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 2.29 and Determinate Nix 3.7.0.<!-- differences -->
+This section lists the differences between upstream Nix 2.30 and Determinate Nix 3.8.0.<!-- differences -->
 
 * In Determinate Nix, flakes are stable. You no longer need to enable the `flakes` experimental feature.
 
@@ -94,3 +94,15 @@ This section lists the differences between upstream Nix 2.29 and Determinate Nix
 * `nix store delete` now explains why deletion fails by @edolstra in [DeterminateSystems/nix-src#130](https://github.com/DeterminateSystems/nix-src/pull/130)
 
 * New command: `nix flake prefetch-inputs` for improved CI performance, by @edolstra in [DeterminateSystems/nix-src#127](https://github.com/DeterminateSystems/nix-src/pull/127)
+
+<!-- Determinate Nix version 3.8.0 -->
+
+* Sync with upstream 2.30.0 by @edolstra in [DeterminateSystems/nix-src#135](https://github.com/DeterminateSystems/nix-src/pull/135)
+
+* nix flake check: Skip substitutable derivations by @edolstra in [DeterminateSystems/nix-src#134](https://github.com/DeterminateSystems/nix-src/pull/134)
+
+* lockFlake(): When updating a lock, respect the input's lock file by @edolstra in [DeterminateSystems/nix-src#137](https://github.com/DeterminateSystems/nix-src/pull/137)
+
+* Hide double copy warning by @edolstra in [DeterminateSystems/nix-src#138](https://github.com/DeterminateSystems/nix-src/pull/138)
+
+* Remove some dead code to minimize the upstream diff by @edolstra in [DeterminateSystems/nix-src#139](https://github.com/DeterminateSystems/nix-src/pull/139)
diff --git a/doc/manual/source/release-notes-determinate/rl-3.8.0.md b/doc/manual/source/release-notes-determinate/rl-3.8.0.md
new file mode 100644
index 000000000..01438bf2b
--- /dev/null
+++ b/doc/manual/source/release-notes-determinate/rl-3.8.0.md
@@ -0,0 +1,13 @@
+# Release 3.8.0 (2025-07-10)
+
+* Based on [upstream Nix 2.30.0](../release-notes/rl-2.30.md).
+
+## What's Changed
+* Sync with upstream 2.30.0 by @edolstra in [DeterminateSystems/nix-src#135](https://github.com/DeterminateSystems/nix-src/pull/135)
+* nix flake check: Skip substitutable derivations by @edolstra in [DeterminateSystems/nix-src#134](https://github.com/DeterminateSystems/nix-src/pull/134)
+* lockFlake(): When updating a lock, respect the input's lock file by @edolstra in [DeterminateSystems/nix-src#137](https://github.com/DeterminateSystems/nix-src/pull/137)
+* Hide double copy warning by @edolstra in [DeterminateSystems/nix-src#138](https://github.com/DeterminateSystems/nix-src/pull/138)
+* Remove some dead code to minimize the upstream diff by @edolstra in [DeterminateSystems/nix-src#139](https://github.com/DeterminateSystems/nix-src/pull/139)
+
+
+**Full Changelog**: [v3.7.0...v3.8.0](https://github.com/DeterminateSystems/nix-src/compare/v3.7.0...v3.8.0)