diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8fb8cc..d0424e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,14 +7,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.0] - 2026-07-17
+
 Thorough-review batch and repo hardening round. Two runtime behaviour
 changes in `Wolfgang.TryPattern` itself: #273 (fix `Try.Run*` throwing
 on whitespace exception messages) and the `Result.ErrorMessage`
 null-on-success semantic cleanup (see `### Changed` below). Everything
 else is CI / test infrastructure that raises the release-readiness
-bar. MINOR bump anticipated at release time (0.4.0) — new test
-surface, new CI signals, and the null-on-success behaviour change is
-signature-preserving so a 0.x MINOR remains SemVer-compliant.
+bar. MINOR bump — new test surface, new CI signals, and the
+null-on-success behaviour change is signature-preserving so a 0.x
+MINOR remains SemVer-compliant.
 
 ### Changed
 
diff --git a/src/Wolfgang.TryPattern/Wolfgang.TryPattern.csproj b/src/Wolfgang.TryPattern/Wolfgang.TryPattern.csproj
index 5154443..9bc8282 100644
--- a/src/Wolfgang.TryPattern/Wolfgang.TryPattern.csproj
+++ b/src/Wolfgang.TryPattern/Wolfgang.TryPattern.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <TargetFrameworks>net462;netstandard2.0;net8.0;net10.0</TargetFrameworks>
     <LangVersion>14</LangVersion>
-    <Version>0.3.5</Version>
+    <Version>0.4.0</Version>
     <!-- Pin AssemblyVersion to a fixed binding-stability baseline so consumers
          do not need to recompile / add binding redirects on every minor/patch
          bump. Bump only on a deliberate breaking API change. FileVersion +