diff --git a/.version-determinate b/.version-determinate
index 47b322c97..4d9d11cf5 100644
--- a/.version-determinate
+++ b/.version-determinate
@@ -1 +1 @@
-3.4.1
+3.4.2
diff --git a/doc/manual/source/SUMMARY.md.in b/doc/manual/source/SUMMARY.md.in
index 8cce1113c..7b9831734 100644
--- a/doc/manual/source/SUMMARY.md.in
+++ b/doc/manual/source/SUMMARY.md.in
@@ -128,6 +128,7 @@
   - [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 3.4.2 (2025-05-05)](release-notes-determinate/rl-3.4.2.md)
   - [Release 3.4.0 (2025-04-25)](release-notes-determinate/rl-3.4.0.md)
   - [Release 3.3.0 (2025-04-11)](release-notes-determinate/rl-3.3.0.md)
   - [Release 3.1.0 (2025-03-27)](release-notes-determinate/rl-3.1.0.md)
diff --git a/doc/manual/source/release-notes-determinate/changes.md b/doc/manual/source/release-notes-determinate/changes.md
index 5816ef871..b88ef57c5 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 2.24 and Determinate Nix 3.4.0.<!-- differences -->
+This section lists the differences between upstream Nix 2.28 and Determinate Nix 3.4.2.<!-- differences -->
 
 * In Determinate Nix, flakes are stable. You no longer need to enable the `flakes` experimental feature.
 
@@ -15,3 +15,5 @@ This section lists the differences between upstream Nix 2.24 and Determinate Nix
 * Using indirect flake references and implicit inputs is deprecated, see: https://github.com/DeterminateSystems/nix-src/issues/37
 
 * Warnings around "dirty trees" are updated to reduce "dirty" jargon, and now refers to "uncommitted changes".
+
+<!-- Determinate Nix version 3.4.2 -->
diff --git a/doc/manual/source/release-notes-determinate/rl-3.4.2.md b/doc/manual/source/release-notes-determinate/rl-3.4.2.md
new file mode 100644
index 000000000..8acabd442
--- /dev/null
+++ b/doc/manual/source/release-notes-determinate/rl-3.4.2.md
@@ -0,0 +1,4 @@
+# Release 3.4.2 (2025-05-05)
+
+* Based on [upstream Nix 2.28.3](../release-notes/rl-2.28.md).
+