Version 2.0.0-dev.55.0

Merge commit '4a323f8aef90b0dc65c351b978ef66cedd55f73e' into dev
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eac0826..a13f6d2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,16 +1,4 @@
-## 2.0.0-dev.XX.0
-(Add new changes here, and they will be copied to the
- change section for the next dev version)
-
-### Tool Changes
-
-#### dart2js
-
-* Several fixes to improve support for running output of dart2js as a webworker.
-
-* `dart:isolate` implementation removed. To launch background tasks,
-   please use webworkers instead. APIs for webworkers can be accessed from
-   `dart:html` or JS-interop.
+## 2.0.0-dev.55.0
 
 ### Language
 
@@ -22,20 +10,20 @@
   * `Iterable`
   * `Map`
 
-#### Strong Mode
-
-### Core library changes
-
-### Dart VM
-
 ### Tool Changes
 
+#### dart2js
+
+* Several fixes to improve support for running output of dart2js as a webworker.
+
+* `dart:isolate` implementation removed. To launch background tasks,
+  please use webworkers instead. APIs for webworkers can be accessed from
+  `dart:html` or JS-interop.
+
 #### Pub
 
 * Use forward-slash paths to Git on Windows
 
-#### Other Tools
-
 ## 2.0.0-dev.54.0
 
 ### Core library changes
diff --git a/tools/VERSION b/tools/VERSION
index a3f39d7..b5da02e 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -23,9 +23,9 @@
 #  * Making cherry-picks to stable channel
 #     - increase PATCH by 1
 #
-CHANNEL be
+CHANNEL dev
 MAJOR 2
 MINOR 0
 PATCH 0
-PRERELEASE 0
+PRERELEASE 55
 PRERELEASE_PATCH 0