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+# Go App Engine SDK 1.5.5 released
+11 Oct 2011
+Tags: appengine, gofix, release
+Summary: Go App Engine SDK 1.5.5 includes Go release.r60.2.
+OldURL: /go-app-engine-sdk-155-released
+
+Andrew Gerrand
+
+##
+
+Today we released version 1.5.5 the Go App Engine SDK.
+You can download it from the [App Engine downloads page](http://code.google.com/appengine/downloads.html).
+
+This release includes changes and improvements to the App Engine APIs and
+brings the supporting Go tool chain to [release.r60.2](https://golang.org/doc/devel/release.html#r60)
+(the current stable release).
+Also included in this release are the [godoc](https://golang.org/cmd/godoc/),
+[gofmt](https://golang.org/cmd/gofmt/),
+and [gofix](https://golang.org/cmd/gofix/) tools from the Go tool chain.
+They can be found in the root directory of the SDK.
+
+Some changes made in this release are backwards-incompatible,
+so we have incremented the SDK `api_version` to 3.
+Existing apps will require code changes when migrating to `api_version` 3.
+
+The gofix tool that ships with the SDK has been customized with App Engine-specific modules.
+It can be used to automatically update Go apps to work with the latest appengine
+packages and the updated Go standard library.
+To update your apps, run:
+
+	/path/to/sdk/gofix /path/to/your/app
+
+The SDK now includes the appengine package source code,
+so you can use the local godoc to read App Engine API documentation:
+
+	/path/to/sdk/godoc appengine/datastore Get
+
+**Important note:** We have deprecated `api_version` 2.
+Go apps that use `api_version` 2 will stop working after 16 December 2011.
+Please update your apps to use `api_version` 3 before then.
+
+See the [release notes](http://code.google.com/p/googleappengine/wiki/SdkForGoReleaseNotes)
+for a full list of changes.
+Please direct any questions about the new SDK to the [Go App Engine discussion group](http://groups.google.com/group/google-appengine-go).