Updates version (#55)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e23bdf8..7a10387 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.13.7
+
+* Supports nested at-rules.
+* Supports nested HTML comments in CSS comments and vice-versa.
+
 ## 0.13.6
 
 * Adds support for `@viewport`.
diff --git a/pubspec.yaml b/pubspec.yaml
index 8ed29b6..8634c95 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: csslib
-version: 0.13.6
+version: 0.13.7
 author: Dart Team <misc@dartlang.org>
 description: A library for parsing CSS.
 homepage: https://github.com/dart-lang/csslib