diff --git a/CHANGES.md b/CHANGES.md
index 9de7115ee5f..0f6d5244acc 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -6,8 +6,9 @@ Beta Releases
 
 ### b13 - xx/xx/2013
 
-* Breaking changes:
+### b12a - 01/18/2013
 
+* Breaking changes:
    * Renamed the `server` property to `url` when constructing a `BingMapsImageryProvider`.  Likewise, renamed `BingMapsImageryProvider.getServer` to `BingMapsImageryProvider.getUrl`.  Code that looked like
    
             var bing = new BingMapsImageryProvider({
@@ -36,7 +37,9 @@ Beta Releases
 * Fixed camera tilt close to the `minimumZoomDistance`.
 * Fixed a bug that could lead to blue tiles when zoomed in close to the North and South poles.
 * Fixed a bug where removing labels would remove the wrong label and ultimately cause a crash.
+* Worked around a bug in Firefox 18 preventing typed arrays from being transferred to or from Web Workers.
 * Upgraded RequireJS to version 2.1.2, and Almond to 0.2.3.
+* Updated the default Bing Maps API key.
 
 ### b12 - 01/03/2013
 
diff --git a/build.xml b/build.xml
index 99efe99ef57..dca3ef985cb 100644
--- a/build.xml
+++ b/build.xml
@@ -82,7 +82,7 @@
 	<property name="build.minification" value="false" />
 
 	<!-- Inputs -->
-	<property name="version" value="b12" />
+	<property name="version" value="b12a" />
 	<property name="sourceDirectory" location="Source" />
 	<property name="shadersDirectory" location="${sourceDirectory}/Shaders" />
 	<property name="examplesDirectory" location="Examples" />