diff --git a/demo/03/pom.xml b/demo/03/pom.xml
index 5568ea7..a5ebbf0 100644
--- a/demo/03/pom.xml
+++ b/demo/03/pom.xml
@@ -18,6 +18,7 @@
         <maven.compiler.release>${java.version}</maven.compiler.release>
 
         <lombok.version>1.18.24</lombok.version>
+        <vavr.io.version>0.10.4</vavr.io.version>
         <junit.version>5.9.0</junit.version>
         <assertj.version>3.23.1</assertj.version>
         <mockito.version>4.8.0</mockito.version>
@@ -37,6 +38,11 @@
             <version>${lombok.version}</version>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>io.vavr</groupId>
+            <artifactId>vavr</artifactId>
+            <version>${vavr.io.version}</version>
+        </dependency>
 
     
         <!-- Testing dependencies-->