diff --git a/CHANGELOG.md b/CHANGELOG.md
index 06b19b0..68ddfaf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,16 @@
 
 All notable changes to this project will be documented in this file.
 
+## 0.4.1 - 2026-09-07
+
+### Bug Fixes
+
+- fix: correct erfc_inv's sign error and keep evidence in log space
+
+### Testing
+
+- test: pin quality()'s N-group closed form, closing the README cross-check
+
 ## 0.4.0 - 2026-09-07
 
 ### Breaking Changes
@@ -25,6 +35,10 @@ All notable changes to this project will be documented in this file.
 - feat: add expected information gain for active matchup selection
 - feat: let observers be shared, boxed, or borrowed
 
+### Miscellaneous Tasks
+
+- chore: Release trueskill-tt version 0.4.0
+
 ## 0.3.0 - 2026-09-01
 
 ### Breaking Changes
diff --git a/Cargo.toml b/Cargo.toml
index 19ac6f3..089ca36 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trueskill-tt"
-version = "0.4.0"
+version = "0.4.1"
 edition = "2024"
 rust-version = "1.85"
 description = "TrueSkill Through Time: Bayesian skill rating that tracks how skill evolves over time, via Gaussian message passing"