diff --git a/model/certification-impl/pom.xml b/model/certification-impl/pom.xml
index 8a164aeafc7..b5e3e36e5cc 100644
--- a/model/certification-impl/pom.xml
+++ b/model/certification-impl/pom.xml
@@ -107,6 +107,10 @@
             <groupId>org.jetbrains</groupId>
             <artifactId>annotations-java5</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+        </dependency>
 
         <!-- Test -->
         <dependency>