diff --git a/.version-determinate b/.version-determinate
index a08ffae0c..269aa9c86 100644
--- a/.version-determinate
+++ b/.version-determinate
@@ -1 +1 @@
-3.8.2
+3.8.3
diff --git a/doc/manual/source/SUMMARY.md.in b/doc/manual/source/SUMMARY.md.in
index 03a18f331..0f90b2c6e 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 3.8.3 (2025-07-18)](release-notes-determinate/rl-3.8.3.md)
   - [Release 3.8.2 (2025-07-12)](release-notes-determinate/rl-3.8.2.md)
   - [Release 3.8.1 (2025-07-11)](release-notes-determinate/rl-3.8.1.md)
   - [Release 3.8.0 (2025-07-10)](release-notes-determinate/rl-3.8.0.md)
diff --git a/doc/manual/source/release-notes-determinate/changes.md b/doc/manual/source/release-notes-determinate/changes.md
index 8c5f30770..7273196ee 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 2.30 and Determinate Nix 3.8.2.<!-- differences -->
+This section lists the differences between upstream Nix 2.30 and Determinate Nix 3.8.3.<!-- differences -->
 
 * In Determinate Nix, flakes are stable. You no longer need to enable the `flakes` experimental feature.
 
@@ -110,3 +110,9 @@ This section lists the differences between upstream Nix 2.30 and Determinate Nix
 * ci: don't run the full test suite for x86_64-darwin by @grahamc in [DeterminateSystems/nix-src#144](https://github.com/DeterminateSystems/nix-src/pull/144)
 
 * Try publishing the manual again by @grahamc in [DeterminateSystems/nix-src#145](https://github.com/DeterminateSystems/nix-src/pull/145)
+
+<!-- Determinate Nix version 3.8.3 -->
+
+* Add an `external-builders` experimental feature by @cole-h in [DeterminateSystems/nix-src#141](https://github.com/DeterminateSystems/nix-src/pull/141)
+
+* Add support for external builders by @edolstra in [DeterminateSystems/nix-src#78](https://github.com/DeterminateSystems/nix-src/pull/78)
diff --git a/doc/manual/source/release-notes-determinate/rl-3.8.3.md b/doc/manual/source/release-notes-determinate/rl-3.8.3.md
new file mode 100644
index 000000000..d3eb02bc7
--- /dev/null
+++ b/doc/manual/source/release-notes-determinate/rl-3.8.3.md
@@ -0,0 +1,26 @@
+# Release 3.8.3 (2025-07-18)
+
+* Based on [upstream Nix 2.30.1](../release-notes/rl-2.30.md).
+
+## What's Changed
+
+### Non-blocking evaluation caching
+
+Users reported evaluation would occasionally block other evaluation processes.
+
+The evaluation cache database is now opened in write-ahead mode to prevent delaying evaluations.
+
+PR: [DeterminateSystems/nix-src#150](https://github.com/DeterminateSystems/nix-src/pull/150)
+
+### New experimental feature: `external-builders`
+
+This experimental feature allows Nix to call an external program for the build environment.
+
+The interface and behavior of this feature may change at any moment without a correspondingly major semver version change.
+
+PRs:
+- [DeterminateSystems/nix-src#141](https://github.com/DeterminateSystems/nix-src/pull/141)
+- [DeterminateSystems/nix-src#152](https://github.com/DeterminateSystems/nix-src/pull/152)
+- [DeterminateSystems/nix-src#78](https://github.com/DeterminateSystems/nix-src/pull/78)
+
+**Full Changelog**: [v3.8.2...v3.8.3](https://github.com/DeterminateSystems/nix-src/compare/v3.8.2...v3.8.3)