diff --git a/pom.xml b/pom.xml
index 8e66ff8..0dfc89a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,7 +9,7 @@
     <version>1.0-SNAPSHOT</version>
 
     <properties>
-        <kotlin.version>1.1.4</kotlin.version>
+        <kotlin.version>1.1.50</kotlin.version>
         <pippo.version>1.5.0</pippo.version>
     </properties>
     <repositories>
@@ -99,44 +99,32 @@
 
     <build>
         <plugins>
-            <!--<plugin>-->
-                <!--<groupId>org.jetbrains.kotlin</groupId>-->
-                <!--<artifactId>kotlin-maven-plugin</artifactId>-->
-                <!--<version>${kotlin.version}</version>-->
-                <!--<executions>-->
-                    <!--<execution>-->
-                        <!--<id>compile</id>-->
-                        <!--<phase>compile</phase>-->
-                        <!--<goals>-->
-                            <!--<goal>compile</goal>-->
-                        <!--</goals>-->
-                    <!--</execution>-->
-                    <!--<execution>-->
-                        <!--<id>test-compile</id>-->
-                        <!--<phase>test-compile</phase>-->
-                        <!--<goals>-->
-                            <!--<goal>test-compile</goal>-->
-                        <!--</goals>-->
-                    <!--</execution>-->
-                <!--</executions>-->
-                <!--<configuration>-->
-                    <!--<jvmTarget>1.8</jvmTarget>-->
-                <!--</configuration>-->
-            <!--</plugin>-->
             <plugin>
                 <artifactId>kotlin-maven-plugin</artifactId>
                 <groupId>org.jetbrains.kotlin</groupId>
                 <version>${kotlin.version}</version>
-
                 <executions>
                     <execution>
                         <id>compile</id>
-                        <goals> <goal>compile</goal> </goals>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                        <configuration>
+                            <sourceDirs>
+                                <sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
+                                <sourceDir>${project.basedir}/src/main/java</sourceDir>
+                            </sourceDirs>
+                        </configuration>
                     </execution>
-
                     <execution>
                         <id>test-compile</id>
                         <goals> <goal>test-compile</goal> </goals>
+                        <configuration>
+                            <sourceDirs>
+                                <sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
+                                <sourceDir>${project.basedir}/src/test/java</sourceDir>
+                            </sourceDirs>
+                        </configuration>
                     </execution>
                 </executions>
             </plugin>