diff --git a/CHANGES.md b/CHANGES.md
index 99d7ea1..e27ae90 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,14 @@
 Changelog
 =========
 
+1.0.0
+-----
+
+* Use `pkg_resources` vendored with `pip`.
+
+* Besides this, there's no other change in this major version release.
+
+
 0.13.2
 ------
 
diff --git a/pipdeptree.py b/pipdeptree.py
index a8dfcce..85ba88c 100644
--- a/pipdeptree.py
+++ b/pipdeptree.py
@@ -24,7 +24,7 @@ from pip._vendor import pkg_resources
 # from graphviz import backend, Digraph
 
 
-__version__ = '0.13.2'
+__version__ = '1.0.0'
 
 
 flatten = chain.from_iterable