diff --git a/pom.xml b/pom.xml
index f5cba19..6c758ab 100644
--- a/pom.xml
+++ b/pom.xml
@@ -141,11 +141,6 @@
         </dependency>
 
         <!-- test -->
-        <dependency>
-            <groupId>org.junit.vintage</groupId>
-            <artifactId>junit-vintage-engine</artifactId>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-simple</artifactId>
diff --git a/src/test/java/com/powsybl/ws/commons/SecuredZipInputStreamTest.java b/src/test/java/com/powsybl/ws/commons/SecuredZipInputStreamTest.java
index 0bbea2a..58a4256 100644
--- a/src/test/java/com/powsybl/ws/commons/SecuredZipInputStreamTest.java
+++ b/src/test/java/com/powsybl/ws/commons/SecuredZipInputStreamTest.java
@@ -7,7 +7,7 @@
 package com.powsybl.ws.commons;
 
 import com.google.common.io.ByteStreams;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
@@ -15,14 +15,14 @@
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
-import static org.junit.Assert.*;
+import static org.junit.jupiter.api.Assertions.*;
 
 /**
  * @author Etienne Homer <etienne.homer at rte-france.com>
  */
-public class SecuredZipInputStreamTest {
+class SecuredZipInputStreamTest {
     @Test
-    public void test() throws IOException {
+    void test() throws IOException {
         byte[] fileContent = ByteStreams.toByteArray(Objects.requireNonNull(getClass().getResourceAsStream("/MicroGridTestConfiguration_T4_BE_BB_Complete_v2.zip")));
         try (SecuredZipInputStream tooManyEntriesSecuredZis = new SecuredZipInputStream(new ByteArrayInputStream(fileContent), 3, 1000000000)) {
             assertTrue(assertThrows(IllegalStateException.class, () -> readZip(tooManyEntriesSecuredZis))
@@ -40,7 +40,7 @@ public void test() throws IOException {
         }
     }
 
-    public int readZip(ZipInputStream zis) throws IOException {
+    private static int readZip(ZipInputStream zis) throws IOException {
         ZipEntry entry = zis.getNextEntry();
         int readBytes = 0;
         while (entry != null) {