diff --git a/backend/pom.xml b/backend/pom.xml
index 3dd1439..e9f8ab8 100644
--- a/backend/pom.xml
+++ b/backend/pom.xml
@@ -87,6 +87,11 @@
             <artifactId>jackson-datatype-joda</artifactId>
             <version>2.9.5</version>
         </dependency>
+        <dependency>
+            <groupId>org.jadira.usertype</groupId>
+            <artifactId>usertype.core</artifactId>
+            <version>7.0.0.CR1</version>
+        </dependency>
 
         <dependency>
             <groupId>org.springframework.boot</groupId>