diff --git a/core/pom.xml b/core/pom.xml
index a997cc8..d2db095 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -24,7 +24,7 @@
     <dependency>
       <groupId>org.apache.opennlp</groupId>
       <artifactId>opennlp-tools</artifactId>
-      <version>1.5.3</version>
+      <version>2.5.9</version>
     </dependency>
     <dependency>
 	  <groupId>org.apache.commons</groupId>