diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a670aa..44165d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [3.1.1] - 2021-12-28
+
+### Fixed
+
+- (#62) Due to floating point accuracy `count_cycles` sometimes returned
+  more bins than what was specified by argument `nbins`. Thank you
+  [Kyle6699](https://github.com/Kyle6699) for reporting the bug and
+  providing a test case.
+
 ## [3.1.0] - 2021-11-16
 
 ### Changed
diff --git a/pyproject.toml b/pyproject.toml
index bed63f5..b4478f6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "rainflow"
-version = "3.1.0"
+version = "3.1.1"
 description = "Implementation of ASTM E1049-85 rainflow cycle counting algorithm"
 authors = ["Piotr Janiszewski <i.am.like.me@gmail.com>"]
 license = "MIT"