diff --git a/OWLTools-Parent/pom.xml b/OWLTools-Parent/pom.xml
index 810c0e4c0..628b323ed 100644
--- a/OWLTools-Parent/pom.xml
+++ b/OWLTools-Parent/pom.xml
@@ -18,7 +18,7 @@
 	</issueManagement>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<owlapi.version>4.2.6</owlapi.version>
+		<owlapi.version>4.5.28</owlapi.version>
 		<slf4j.version>1.7.10</slf4j.version>
 	</properties>