diff --git a/CHANGELOG.md b/CHANGELOG.md
index a55759ea..cce784d1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 All notable changes to this project will be documented in this file.
 
+## [2.3.1] - 2022-10-19
+### Fixed
+- Integrated autocorrelation times are now correctly estimated for gapped irregular Monte Carlo chains.
+- The output of `Obs.details` was improved and now contains information about the stepsize in configurations for which the integrated autocorrelation time was estimated.
+
 ## [2.3.0] - 2022-10-13
 ### Added
 - `least_squares` and `total_least_squares` fits now have an optional keyword argument `num_grad`. If this argument is set to `True` the error propagation of the fit is performed via numerical instead of automatic differentiation. This options allows for fits functions which contain special functions or which are not analytically known.
diff --git a/pyerrors/version.py b/pyerrors/version.py
index fc1038a9..3a5935a2 100644
--- a/pyerrors/version.py
+++ b/pyerrors/version.py
@@ -1 +1 @@
-__version__ = "2.4.0+dev"
+__version__ = "2.3.1"