diff --git a/concursus-domain/pom.xml b/concursus-domain/pom.xml
index 9fc9696..6c5a126 100644
--- a/concursus-domain/pom.xml
+++ b/concursus-domain/pom.xml
@@ -36,6 +36,11 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+        </dependency>
+
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-all</artifactId>