OPENJPA-2871 update to xbean-4.20
diff --git a/pom.xml b/pom.xml
index 91907cc..9bee3f4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -98,7 +98,7 @@
         <javadoc.additionalparam />
         <maven.surefire.version>3.0.0-M4</maven.surefire.version>
 
-        <xbean.version>4.18</xbean.version>
+        <xbean.version>4.20</xbean.version>
         <bval.version>1.1.2</bval.version>
         <log4j2.version>2.14.1</log4j2.version>
         <ant.version>1.10.9</ant.version>