diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 25e972fc..46c31160 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -1,6 +1,6 @@
 # Wikibase DataModel release notes
 
-## Version 5.1 (dev)
+## Version 5.1.0 (dev)
 
 * `Item::copy` and `Property::copy` do not clone immutable objects any more, saving time and memory
 * Deprecated `FingerprintHolder` and `StatementListHolder`
diff --git a/WikibaseDataModel.php b/WikibaseDataModel.php
index da023f7d..3cbd8845 100644
--- a/WikibaseDataModel.php
+++ b/WikibaseDataModel.php
@@ -7,7 +7,7 @@
  * @author Jeroen De Dauw < jeroendedauw@gmail.com >
  */
 
-define( 'WIKIBASE_DATAMODEL_VERSION', '5.0.2' );
+define( 'WIKIBASE_DATAMODEL_VERSION', '5.1.0' );
 
 if ( defined( 'MEDIAWIKI' ) && function_exists( 'wfLoadExtension' ) ) {
 	wfLoadExtension( 'WikibaseDataModel', __DIR__ . '/mediawiki-extension.json' );
diff --git a/composer.json b/composer.json
index d15f87d1..c777a1ab 100644
--- a/composer.json
+++ b/composer.json
@@ -41,7 +41,7 @@
 	},
 	"extra": {
 		"branch-alias": {
-			"dev-master": "5.0.x-dev"
+			"dev-master": "5.1.x-dev"
 		}
 	},
 	"scripts": {
diff --git a/mediawiki-extension.json b/mediawiki-extension.json
index 5440c370..bd92709d 100644
--- a/mediawiki-extension.json
+++ b/mediawiki-extension.json
@@ -1,6 +1,6 @@
 {
 	"name": "Wikibase DataModel",
-	"version": "5.0.2",
+	"version": "5.1.0",
 	"author": [
 		"[https://www.mediawiki.org/wiki/User:Jeroen_De_Dauw Jeroen De Dauw]",
 		"Thiemo Mättig"
diff --git a/src/Statement/StatementListHolder.php b/src/Statement/StatementListHolder.php
index 7c260e30..e6157d2a 100644
--- a/src/Statement/StatementListHolder.php
+++ b/src/Statement/StatementListHolder.php
@@ -6,7 +6,8 @@
  * Interface for classes that contain a StatementList.
  *
  * @since 3.0
- * @deprecated since 5.1
+ * @deprecated since 5.1, will be removed in 6.0 in favor of StatementListProvider, which will then
+ *  give the guarantee to return an object by reference. Changes to that object change the entity.
  *
  * @license GNU GPL v2+
  * @author Thiemo Mättig
diff --git a/src/Term/FingerprintHolder.php b/src/Term/FingerprintHolder.php
index fdfb5804..a94328da 100644
--- a/src/Term/FingerprintHolder.php
+++ b/src/Term/FingerprintHolder.php
@@ -4,7 +4,8 @@
 
 /**
  * @since 4.1
- * @deprecated since 5.1
+ * @deprecated since 5.1, will be removed in 6.0 in favor of FingerprintProvider, which will then
+ *  give the guarantee to return an object by reference. Changes to that object change the entity.
  *
  * @licence GNU GPL v2+
  * @author Bene* < benestar.wikimedia@gmail.com >