diff --git a/CHANGES.md b/CHANGES.md
index cc3f56b..248e1aa 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,6 +5,17 @@ for a full listing of issues for each release.
 
 --------------------------------------------------------------------------------
 
+## isodatetime 2018.02.0 (Released 2018-02-06)
+
+This is the 9th release of isodatetime.
+
+### Noteworthy Changes
+
+[#82](https://github.com/metomi/isodatetime/pull/82):
+Fix subtracting a later timepoint from an earlier one.
+
+--------------------------------------------------------------------------------
+
 ## isodatetime 2017.08.0 (Released 2017-08-09)
 
 This is the 8th release of isodatetime.
diff --git a/isodatetime/__init__.py b/isodatetime/__init__.py
index 0711d1c..e2c7500 100644
--- a/isodatetime/__init__.py
+++ b/isodatetime/__init__.py
@@ -17,4 +17,4 @@
 # ----------------------------------------------------------------------------
 """Python ISO 8601 date time parser and data model/manipulation utilities."""
 
-__version__ = "2017.08.0"
+__version__ = "2018.02.0"