diff --git a/.upgrade.yml b/.upgrade.yml
new file mode 100644
index 0000000..ce4f759
--- /dev/null
+++ b/.upgrade.yml
@@ -0,0 +1,10 @@
+mappings:
+  CMSExternalLinks_Controller: SilverStripe\ExternalLinks\Controllers\CMSExternalLinks_Controller
+  CheckExternalLinksJob: SilverStripe\ExternalLinks\Jobs\CheckExternalLinksJob
+  BrokenExternalLink: SilverStripe\ExternalLinks\Model\BrokenExternalLink
+  BrokenExternalPageTrack: SilverStripe\ExternalLinks\Model\BrokenExternalPageTrack
+  BrokenExternalPageTrackStatus: SilverStripe\ExternalLinks\Model\BrokenExternalPageTrackStatus
+  BrokenExternalLinksReport: SilverStripe\ExternalLinks\Reports\BrokenExternalLinksReport
+  CheckExternalLinksTask: SilverStripe\ExternalLinks\Tasks\CheckExternalLinksTask
+  CurlLinkChecker: SilverStripe\ExternalLinks\Tasks\CurlLinkChecker
+  LinkChecker: SilverStripe\ExternalLinks\Tasks\LinkChecker
diff --git a/src/Controllers/CMSExternalLinks.php b/src/Controllers/CMSExternalLinks.php
index 2b0efb6..9b59eaf 100644
--- a/src/Controllers/CMSExternalLinks.php
+++ b/src/Controllers/CMSExternalLinks.php
@@ -1,5 +1,14 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Controllers;
+
+use Controller;
+use HTTP;
+use BrokenExternalPageTrackStatus;
+use CheckExternalLinksJob;
+use CheckExternalLinksTask;
+
+
 class CMSExternalLinks_Controller extends Controller {
 
 	private static $allowed_actions = array('getJobStatus', 'start');
diff --git a/src/Jobs/CheckExternalLinksJob.php b/src/Jobs/CheckExternalLinksJob.php
index 3f4311a..48dd723 100644
--- a/src/Jobs/CheckExternalLinksJob.php
+++ b/src/Jobs/CheckExternalLinksJob.php
@@ -1,5 +1,12 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Jobs;
+
+use AbstractQueuedJob;
+use QueuedJob;
+use CheckExternalLinksTask;
+
+
 if(!class_exists('AbstractQueuedJob')) return;
 
 /**
diff --git a/src/Model/BrokenExternalLink.php b/src/Model/BrokenExternalLink.php
index 18c484f..93fa065 100644
--- a/src/Model/BrokenExternalLink.php
+++ b/src/Model/BrokenExternalLink.php
@@ -1,5 +1,13 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Model;
+
+use DataObject;
+use Member;
+use Permission;
+use Config;
+
+
 /**
  * Represents a single link checked for a single run that is broken
  *
diff --git a/src/Model/BrokenExternalPageTrack.php b/src/Model/BrokenExternalPageTrack.php
index 828b541..f22c971 100644
--- a/src/Model/BrokenExternalPageTrack.php
+++ b/src/Model/BrokenExternalPageTrack.php
@@ -1,5 +1,11 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Model;
+
+use DataObject;
+use Versioned;
+
+
 /**
  * Represents a track for a single page
  */
diff --git a/src/Model/BrokenExternalPageTrackStatus.php b/src/Model/BrokenExternalPageTrackStatus.php
index 141b996..23bcb60 100644
--- a/src/Model/BrokenExternalPageTrackStatus.php
+++ b/src/Model/BrokenExternalPageTrackStatus.php
@@ -1,5 +1,11 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Model;
+
+use DataObject;
+use Versioned;
+
+
 /**
  * Represents the status of a track run
  *
diff --git a/src/Reports/BrokenExternalLinksReport.php b/src/Reports/BrokenExternalLinksReport.php
index 233d898..3f35321 100644
--- a/src/Reports/BrokenExternalLinksReport.php
+++ b/src/Reports/BrokenExternalLinksReport.php
@@ -1,5 +1,15 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Reports;
+
+use SS_Report;
+use Convert;
+use BrokenExternalPageTrackStatus;
+use ArrayList;
+use Requirements;
+use LiteralField;
+
+
 /**
  * Content side-report listing pages with external broken links
  * @package externallinks
diff --git a/src/Tasks/CheckExternalLinksTask.php b/src/Tasks/CheckExternalLinksTask.php
index 6c3fadf..2285793 100644
--- a/src/Tasks/CheckExternalLinksTask.php
+++ b/src/Tasks/CheckExternalLinksTask.php
@@ -1,5 +1,18 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Tasks;
+
+use BuildTask;
+use Debug;
+use BrokenExternalPageTrack;
+use DOMNode;
+use BrokenExternalLink;
+use Config;
+use BrokenExternalPageTrackStatus;
+use Injector;
+use DB;
+
+
 class CheckExternalLinksTask extends BuildTask {
 
 	private static $dependencies = array(
diff --git a/src/Tasks/CurlLinkChecker.php b/src/Tasks/CurlLinkChecker.php
index a84439d..4d95506 100644
--- a/src/Tasks/CurlLinkChecker.php
+++ b/src/Tasks/CurlLinkChecker.php
@@ -1,5 +1,10 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Tasks;
+
+use SS_Cache;
+
+
 /**
  * Check links using curl
  */
diff --git a/src/Tasks/LinkChecker.php b/src/Tasks/LinkChecker.php
index 629f177..f273448 100644
--- a/src/Tasks/LinkChecker.php
+++ b/src/Tasks/LinkChecker.php
@@ -1,5 +1,10 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Tasks;
+
+
+
+
 /**
  * Provides an interface for checking that a link is valid
  */