diff --git a/assets/xsd/book.xsd b/assets/xsd/book.xsd
index e3e122c..a7e2cf8 100644
--- a/assets/xsd/book.xsd
+++ b/assets/xsd/book.xsd
@@ -6,7 +6,7 @@
 		elementFormDefault="qualified"
 >
 	
-	<xs:include schemaLocation="https://book.sukazyo.cc/assets/xsd/configuations.xsd" />
+	<xs:include schemaLocation="https://book.sukazyo.cc/assets/xsd/configurations.xsd" />
 	
 	<xs:element name="Book">
 		<xs:complexType>
@@ -14,7 +14,7 @@
 				
 				<xs:element name="book_name" type="xs:string" />
 				
-				<xs:element name="configurations" type="phb-config-level-book" />
+				<xs:element name="configurations" type="phb-config-level-book" minOccurs="0" />
 				
 				<xs:element name="contents" type="bookContents" />
 				
diff --git a/assets/xsd/bookshelf.xsd b/assets/xsd/bookshelf.xsd
index 275fa22..18c9812 100644
--- a/assets/xsd/bookshelf.xsd
+++ b/assets/xsd/bookshelf.xsd
@@ -7,7 +7,7 @@
 >
 	
 	<xs:include schemaLocation="https://book.sukazyo.cc/assets/xsd/book.xsd" />
-	<xs:include schemaLocation="https://book.sukazyo.cc/assets/xsd/configuations.xsd" />
+	<xs:include schemaLocation="https://book.sukazyo.cc/assets/xsd/configurations.xsd" />
 	
 	<xs:element name="BookShelf">
 		<xs:complexType>
diff --git a/constant.php b/constant.php
index 185137b..9aeae13 100644
--- a/constant.php
+++ b/constant.php
@@ -2,6 +2,6 @@
 
 const APP_NAME = "ph-Bookshelf";
 
-const VERSION = "0.5.0-alpha9";
+const VERSION = "0.5.0-alpha10";
 const CHANNEL = "suk-ws";
 const BRANCH = "config-v2.0";