diff --git a/.travis.yml b/.travis.yml
index fc0913f..99366b5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,7 @@ php:
 
 env:
   global:
-    - CORE_RELEASE=3
+    - CORE_RELEASE=master
   matrix:
     - DB=MYSQL
     - DB=PGSQL
diff --git a/README.md b/README.md
index c1097b7..fea12af 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ If more isolation of code, security, or performance is needed, then consider run
 
 ## Requirements
 
-*  SilverStripe 3.1
+*  SilverStripe 4.x
 
 ## Installation
 
diff --git a/code/extensions/FileSubsites.php b/code/extensions/FileSubsites.php
index 2aee52c..44eb3b0 100644
--- a/code/extensions/FileSubsites.php
+++ b/code/extensions/FileSubsites.php
@@ -57,7 +57,7 @@ class FileSubsites extends DataExtension {
 	/**
 	 * Update any requests to limit the results to the current site
 	 */
-	public function augmentSQL(SQLQuery &$query) {
+	public function augmentSQL(SQLSelect $query) {
 		if(Subsite::$disable_subsite_filter) return;
 
 		// If you're querying by ID, ignore the sub-site - this is a bit ugly... (but it was WAYYYYYYYYY worse)
diff --git a/code/extensions/GroupSubsites.php b/code/extensions/GroupSubsites.php
index 11f0b9d..dcd3e6e 100644
--- a/code/extensions/GroupSubsites.php
+++ b/code/extensions/GroupSubsites.php
@@ -107,7 +107,7 @@ class GroupSubsites extends DataExtension implements PermissionProvider {
 	/**
 	 * Update any requests to limit the results to the current site
 	 */
-	public function augmentSQL(SQLQuery &$query) {
+	public function augmentSQL(SQLSelect $query) {
 		if(Subsite::$disable_subsite_filter) return;
 		if(Cookie::get('noSubsiteFilter') == 'true') return;
 
diff --git a/code/extensions/SiteConfigSubsites.php b/code/extensions/SiteConfigSubsites.php
index c0f66c2..21a441d 100644
--- a/code/extensions/SiteConfigSubsites.php
+++ b/code/extensions/SiteConfigSubsites.php
@@ -12,7 +12,7 @@ class SiteConfigSubsites extends DataExtension {
 	/**
 	 * Update any requests to limit the results to the current site
 	 */
-	public function augmentSQL(SQLQuery &$query) {
+	public function augmentSQL(SQLSelect $query) {
 		if(Subsite::$disable_subsite_filter) return;
 
 		// If you're querying by ID, ignore the sub-site - this is a bit ugly...
diff --git a/code/extensions/SiteTreeSubsites.php b/code/extensions/SiteTreeSubsites.php
index ebb2a2b..1ec9a6d 100644
--- a/code/extensions/SiteTreeSubsites.php
+++ b/code/extensions/SiteTreeSubsites.php
@@ -25,7 +25,7 @@ class SiteTreeSubsites extends DataExtension {
 	/**
 	 * Update any requests to limit the results to the current site
 	 */
-	public function augmentSQL(SQLQuery &$query, DataQuery &$dataQuery = null) {
+	public function augmentSQL(SQLSelect $query, DataQuery &$dataQuery = null) {
 		if(Subsite::$disable_subsite_filter) return;
 		if($dataQuery->getQueryParam('Subsite.filter') === false) return;
 		
diff --git a/composer.json b/composer.json
index 82e472b..1ebd168 100644
--- a/composer.json
+++ b/composer.json
@@ -11,15 +11,15 @@
 	],
 	"require":
 	{
-		"silverstripe/framework": "~3.2",
-		"silverstripe/cms": "~3.2"
+		"silverstripe/framework": "~4.0",
+		"silverstripe/cms": "~4.0"
 	},
 	"require-dev": {
 		"phpunit/PHPUnit": "~3.7@stable"
 	},
 	"extra": {
 		"branch-alias": {
-			"dev-master": "1.1.x-dev"
+			"dev-master": "1.2.x-dev"
 		}
 	}
 }