diff --git a/pom.xml b/pom.xml
index 5b76779..5b4727b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -64,6 +64,11 @@
             <artifactId>h2</artifactId>
         </dependency>
 
+        <dependency>
+            <groupId>org.apache.solr</groupId>
+            <artifactId>solr-solrj</artifactId>
+            <version>9.1.1</version>
+        </dependency>
 
         <dependency>
             <groupId>eu.dnetlib.dhp</groupId>