Prepare for 0.12.20+4
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 66fcb7b..76a59e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.12.20+4
+
+* Fixed strong-mode errors and other blockers for compiling with `dev_compiler`.
+
 ## 0.12.20+3
 
 * `--pause-after-load` no longer deadlocks with recent versions of Chrome.
diff --git a/pubspec.yaml b/pubspec.yaml
index 82debcd..c09c4b7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 0.12.20+3
+version: 0.12.20+4
 author: Dart Team <misc@dartlang.org>
 description: A library for writing dart unit tests.
 homepage: https://github.com/dart-lang/test