diff --git a/.version-determinate b/.version-determinate
index c5b45eb7b122..d21858b119b1 100644
--- a/.version-determinate
+++ b/.version-determinate
@@ -1 +1 @@
-3.18.0
+3.18.1
diff --git a/doc/manual/source/SUMMARY.md.in b/doc/manual/source/SUMMARY.md.in
index 60982d7ba954..4b4d48eac775 100644
--- a/doc/manual/source/SUMMARY.md.in
+++ b/doc/manual/source/SUMMARY.md.in
@@ -146,6 +146,7 @@
   - [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 3.18.1 (2026-04-23)](release-notes-determinate/v3.18.1.md)
   - [Release 3.18.0 (2026-04-20)](release-notes-determinate/v3.18.0.md)
   - [Release 3.17.3 (2026-04-07)](release-notes-determinate/v3.17.3.md)
   - [Release 3.17.2 (2026-03-27)](release-notes-determinate/v3.17.2.md)
diff --git a/doc/manual/source/release-notes-determinate/changes.md b/doc/manual/source/release-notes-determinate/changes.md
index f9f2b71f83b0..5f795f31d5d8 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 3.18.0.<!-- differences -->
+This section lists the differences between upstream Nix 2.33 and Determinate Nix 3.18.1.<!-- differences -->
 
 * In Determinate Nix, flakes are stable. You no longer need to enable the `flakes` experimental feature.
 
@@ -183,3 +183,6 @@ This section lists the differences between upstream Nix 2.33 and Determinate Nix
 * Determinate Nix can upload crash info to Sentry. [DeterminateSystems/nix-src#418](https://github.com/DeterminateSystems/nix-src/pull/418)
 
 * Determinate Nix provides the pre-build hook with a JSON serialization of the derivation. [DeterminateSystems/nix-src#424](https://github.com/DeterminateSystems/nix-src/pull/424)
+
+<!-- Determinate Nix version 3.18.1 -->
+
diff --git a/doc/manual/source/release-notes-determinate/v3.18.1.md b/doc/manual/source/release-notes-determinate/v3.18.1.md
new file mode 100644
index 000000000000..26c9592561ad
--- /dev/null
+++ b/doc/manual/source/release-notes-determinate/v3.18.1.md
@@ -0,0 +1,23 @@
+# Release 3.18.1 (2026-04-23)
+
+* Based on [upstream Nix 2.33.4](../release-notes/rl-2.33.md).
+
+## What's Changed
+
+### Sentry integration improvements
+
+This release includes fixes for a couple of issues with the Sentry integration:
+
+* Ensures the chroot helper starts before the Sentry thread, allowing chroot stores to work again
+* Resets Mach exception ports on macOS, so that exec'd programs do not communicate with Determinate Nix's `crashpad_handler`
+
+Additionally, Determinate Nix now includes the Nix command and subcommand to Sentry reports to make it easier to discern where an issue happened.
+Not that this does _not_ include any command-line arguments other than the command (such as `nix-daemon` and `nix`) and subcommand (such as `flake show`).
+
+PRs:
+* [DeterminateSystems/nix-src#433](https://github.com/DeterminateSystems/nix-src/pull/433)
+* [DeterminateSystems/nix-src#432](https://github.com/DeterminateSystems/nix-src/pull/432)
+* [DeterminateSystems/nix-src#436](https://github.com/DeterminateSystems/nix-src/pull/436)
+
+
+**Full Changelog**: [v3.18.0...v3.18.1](https://github.com/DeterminateSystems/nix-src/compare/v3.18.0...v3.18.1)