Version 0.12.0 (dart-lang/coverage#223)

diff --git a/pkgs/coverage/CHANGELOG.md b/pkgs/coverage/CHANGELOG.md
index 571ef53..de12297 100644
--- a/pkgs/coverage/CHANGELOG.md
+++ b/pkgs/coverage/CHANGELOG.md
@@ -1,5 +1,6 @@
-## Unreleased changes
+## 0.12.0 - 2018-06-26
 
+ * BREAKING CHANGE: This version requires Dart SDK 2.0.0-dev.64.1 or later.
  * Strong mode fixes as of Dart SDK 2.0.0-dev.64.1.
 
 ## 0.11.0 - 2018-04-12
diff --git a/pkgs/coverage/pubspec.yaml b/pkgs/coverage/pubspec.yaml
index f2d67b3..99a7e74 100644
--- a/pkgs/coverage/pubspec.yaml
+++ b/pkgs/coverage/pubspec.yaml
@@ -1,10 +1,10 @@
 name: coverage
-version: 0.11.0
+version: 0.12.0
 author: Dart Team <misc@dartlang.org>
 description: Coverage data manipulation and formatting
 homepage: https://github.com/dart-lang/coverage
 environment:
-  sdk: '>=2.0.0-dev.30 <2.0.0'
+  sdk: '>=2.0.0-dev.64.1 <2.0.0'
 dependencies:
   args: '>=1.0.0 <2.0.0'
   logging: '>=0.9.0 <0.12.0'