diff --git a/CHANGELOG.md b/CHANGELOG.md
index 457b8aa3..3f1c4eb3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,22 @@
 # CHANGELOG
 
 
+## v0.30.1 (2026-09-10)
+
+### Bug Fixes
+
+- Only set transmission when it actually differs
+  ([`702eb7d`](https://gitea.psi.ch/mx/AareDAQ/commit/702eb7d9f9a8ae02142ee3c40f4bab460d597c2a))
+
+The guard introduced with the transmission IOC workaround was inverted: `abs(request - readback) <
+  0.001` fires only when the beamline is already at the requested value, so any real transmission
+  change was skipped and collections ran at whatever transmission happened to be set.
+
+Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
+
+Claude-Session: https://claude.ai/code/session_01Ni1Uhb1WqzpXPwcYsvqnH1
+
+
 ## v0.30.0 (2026-09-10)
 
 ### Bug Fixes
diff --git a/pyproject.toml b/pyproject.toml
index 95e4d920..c6382048 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "aaredaq"
-version = "0.30.0"
+version = "0.30.1"
 description = "AareDAQ (with GUI)"
 readme = "README.md"
 requires-python = ">=3.11"