diff --git a/README.md b/README.md
index 0df358f..bab4918 100644
--- a/README.md
+++ b/README.md
@@ -34,4 +34,10 @@ HomePage:
     - PurpleSpider\BasicGalleries\PhotoGalleryExtension
   gallery-title: Image Gallery
   gallery-cms-tab: Main
-````
\ No newline at end of file
+````
+
+## Version Details
+
+* 0.* = Silverstripe 3
+* 1.* = Silverstripe 4
+* 2.* = Silverstripe 4 (Uses newer version of `PhotoGalleryExtension` with a polymorphic relation, so upgrading from 1 to 2 will break existing galleries.)
\ No newline at end of file
diff --git a/composer.json b/composer.json
index d0a0092..1201f73 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
 	"require": {
 		"silverstripe/framework": "^4.4",
 		"silverstripe/cms": "^4.4",
-		"purplespider/silverstripe-basic-gallery-extension": "^1"
+		"purplespider/silverstripe-basic-gallery-extension": "^3"
 	},
 	"extra": {
 		"expose": [