diff --git a/model/notifications-impl/pom.xml b/model/notifications-impl/pom.xml
index 81c37ffb441..d44b4206293 100644
--- a/model/notifications-impl/pom.xml
+++ b/model/notifications-impl/pom.xml
@@ -107,6 +107,10 @@
 			<groupId>org.apache.commons</groupId>
 			<artifactId>commons-lang3</artifactId>
 		</dependency>
+        <dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-collections4</artifactId>
+		</dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-email</artifactId>