diff --git a/pom.xml b/pom.xml
index 4354abf..85de452 100644
--- a/pom.xml
+++ b/pom.xml
@@ -31,7 +31,7 @@
         <dependency>
             <groupId>org.apache.opennlp</groupId>
             <artifactId>opennlp-tools</artifactId>
-            <version>1.6.0</version>
+            <version>2.5.9</version>
         </dependency>
         <dependency>
             <groupId>marmot</groupId>