diff --git a/CHANGELOG.md b/CHANGELOG.md
index 14e1293..3026d72 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,23 @@
 # CHANGELOG
 
 
+## v0.4.0 (2026-08-18)
+
+### Features
+
+- **models**: Fluorescence ingest contract shared with AareDB
+  ([`064a1d5`](https://gitea.psi.ch/mx/AareCommon/commit/064a1d5cab1cd94affce2cf5f992c714df62b7f2))
+
+FluorescenceScanIngestModel wraps the existing FluorescenceSpectrumOutputModel with the sample it
+  belongs to — the payload for AareDB's POST /dispatcher/protected_router/fluorescence/ ingest.
+  FluorescenceScanIngestResponseModel returns the stored scan id plus the elements AareDB identified
+  from the peaks, so the beamline GUI can display what was detected.
+
+Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
+
+Claude-Session: https://claude.ai/code/session_01F3xoBJBmqJJPLg475iK6cE
+
+
 ## v0.3.1 (2026-08-17)
 
 ### Bug Fixes
diff --git a/pyproject.toml b/pyproject.toml
index 69aebfb..a6cbee5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "aarecommon"
-version = "0.3.1"
+version = "0.4.0"
 description = "Common components (models, calculations) for Aare packages"
 readme = "README.md"
 requires-python = ">=3.11"