Use Jena 3.1.1
diff --git a/pom.xml b/pom.xml
index fa6a0dd..16671ea 100644
--- a/pom.xml
+++ b/pom.xml
@@ -60,7 +60,7 @@
         <!--  NOTE: jsonldjava is also used by rdf4j and jena, check  -->
         <jsonldjava.version>0.8.3</jsonldjava.version>
         <rdf4j.version>2.1.1</rdf4j.version>
-        <jena.version>3.1.0</jena.version>
+        <jena.version>3.1.1</jena.version>
         <!--  NOTE: dexx and xerces versions should match 
         the versions marked as <optional> in jena-osgi pom
          -->