Update OpenJPA
diff --git a/pom.xml b/pom.xml
index 3cc8dd6..c82b77c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -62,7 +62,7 @@
         <junit.version>4.12</junit.version>
         <kerby.version>1.1.1</kerby.version>
         <log4j.version>1.2.17</log4j.version>
-        <openjpa.version>2.4.3</openjpa.version>
+        <openjpa.version>3.1.0</openjpa.version>
         <servlet.version>2.5</servlet.version>
         <slf4j.version>1.7.28</slf4j.version>
         <spring.version>4.3.25.RELEASE</spring.version>