diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2342075..7585692 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+1.0.0
+-----
+
+* Add dependency on smbus2
+* Add support for alternate i2c bus number
+* Port to hatch/pyproject.toml
+
 0.0.5
 -----
 
diff --git a/ioexpander/__init__.py b/ioexpander/__init__.py
index 65741d3..95f494b 100644
--- a/ioexpander/__init__.py
+++ b/ioexpander/__init__.py
@@ -4,7 +4,7 @@
 
 from . import ioe_regs, sioe_regs
 
-__version__ = "0.0.5"
+__version__ = "1.0.0"
 
 
 # These values encode our desired pin function: IO, ADC, PWM