diff --git a/CHANGELOG b/CHANGELOG
index be4f2c2..8ac2c19 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,8 @@
-## Unreleased
+## 1.9.0
 
 * Drop support for Python 3.6; add support for Python 3.11
+* Add functions `utime_as_datetime`, `datetime_as_utime`,
+  `format_utime_as_iso_8601`, `iso_8601_as_utime`
 
 ## 1.8.0
 
diff --git a/setup.py b/setup.py
index debf2d0..5c47646 100644
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@
 )
 
 
-VERSION = "1.8.0"
+VERSION = "1.9.0"
 
 
 EXTENSIONS = [