diff --git a/README.md b/README.md
index 8cdb32c..9ffbf01 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ The subsites module allows multiple websites to run from a single installation o
 
 ## Requirements
 
-*  SilverStripe 3.0
+*  SilverStripe 3.1
 
 ## Installation
 
@@ -127,4 +127,4 @@ for all subdomains:
 ## Screenshots
 
 ![](docs/en/_images/subsites-module-adminscreenshot-new.png)
-![](docs/en/_images/subsites-module-admindropdown.png)
\ No newline at end of file
+![](docs/en/_images/subsites-module-admindropdown.png)
diff --git a/composer.json b/composer.json
index 3a2cff1..81d3089 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
 	],
 	"require":
 	{
-		"silverstripe/framework": "3.*",
-		"silverstripe/cms": "3.*"
+		"silverstripe/framework": "3.1.*",
+		"silverstripe/cms": "3.1.*"
 	}
 }