diff --git a/pom.xml b/pom.xml
index 508b681..eec0ad7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -139,6 +139,12 @@
             </dependency>
 
             <dependency>
+                <groupId>org.apache.commons</groupId>
+                <artifactId>commons-collections4</artifactId>
+                <version>4.0</version>
+            </dependency>
+
+            <dependency>
                 <groupId>org.codehaus.jackson</groupId>
                 <artifactId>jackson-core-asl</artifactId>
                 <version>1.9.13</version>