diff --git a/pom.xml b/pom.xml
index 438eeda..52b0281 100644
--- a/pom.xml
+++ b/pom.xml
@@ -170,6 +170,12 @@
                     </programs>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <!-- JUnit 5 requires Surefire version 2.22.0 or higher -->
+                <version>2.22.2</version>
+            </plugin>
         </plugins>
     </build>
     <dependencies>
@@ -187,7 +193,7 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
-            <version>RELEASE</version>
+            <version>5.7.0-M1</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -201,5 +207,11 @@
             <artifactId>appassembler-maven-plugin</artifactId>
             <version>2.1.0</version>
         </dependency>
+        <!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-surefire-plugin -->
+        <dependency>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-surefire-plugin</artifactId>
+            <version>2.22.2</version>
+        </dependency>
     </dependencies>
 </project>
\ No newline at end of file
diff --git a/src/main/java/org/ids_mannheim/TotalNGram.java b/src/main/java/org/ids_mannheim/TotalNGrams.java
similarity index 100%
rename from src/main/java/org/ids_mannheim/TotalNGram.java
rename to src/main/java/org/ids_mannheim/TotalNGrams.java