diff --git a/parent/pom.xml b/parent/pom.xml
index 1917f7f..1a3ae6a 100644
--- a/parent/pom.xml
+++ b/parent/pom.xml
@@ -108,9 +108,9 @@
             </dependency>
 
             <dependency>
-                <groupId>junit</groupId>
-                <artifactId>junit</artifactId>
-                <version>4.13.1</version>
+                <groupId>org.junit.jupiter</groupId>
+                <artifactId>junit-jupiter</artifactId>
+                <version>5.14.3</version>
                 <scope>test</scope>
             </dependency>
 
diff --git a/processor/pom.xml b/processor/pom.xml
index d204afd..1344ed0 100644
--- a/processor/pom.xml
+++ b/processor/pom.xml
@@ -46,11 +46,10 @@
         </dependency>
 
         <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
             <scope>test</scope>
         </dependency>
-
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
diff --git a/processor/src/test/java/org/mapstruct/tools/gem/processor/ProcessorTest.java b/processor/src/test/java/org/mapstruct/tools/gem/processor/ProcessorTest.java
index f8cde37..1db5c40 100644
--- a/processor/src/test/java/org/mapstruct/tools/gem/processor/ProcessorTest.java
+++ b/processor/src/test/java/org/mapstruct/tools/gem/processor/ProcessorTest.java
@@ -24,25 +24,18 @@
 import javax.tools.StandardLocation;
 import javax.tools.ToolProvider;
 
-import org.assertj.core.api.JUnitSoftAssertions;
-import org.junit.Rule;
-import org.junit.Test;
-import org.junit.rules.TemporaryFolder;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-public class ProcessorTest {
+class ProcessorTest {
 
-    // CHECKSTYLE:OFF
-    @Rule
-    public final TemporaryFolder tempDir = new TemporaryFolder(); //NOSONAR
-
-    @Rule
-    public final JUnitSoftAssertions softly = new JUnitSoftAssertions();
-    // CHECKSTYLE:ON
+    @TempDir
+    private File tempDir;
 
     @Test
-    public void example() throws IOException, ClassNotFoundException {
+    void example() throws IOException {
         StringJavaFileObject src = new StringJavaFileObject(
             "org.mapstruct.annotations.processor.GemGenerator",
             getSource()
@@ -55,9 +48,9 @@ private void compile(Processor processor, JavaFileObject... compilationUnits) th
 
         DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();
         StandardJavaFileManager fileManager = compiler.getStandardFileManager( diagnostics, null, null );
-        File classesDir = tempDir.newFolder( "classes" );
+        File classesDir = newFolder( tempDir, "classes" );
         fileManager.setLocation( StandardLocation.CLASS_OUTPUT, Collections.singletonList( classesDir ) );
-        File generatedDir = tempDir.newFolder( "generated" );
+        File generatedDir = newFolder( tempDir, "generated" );
         fileManager.setLocation( StandardLocation.SOURCE_OUTPUT, Collections.singletonList( generatedDir ) );
 
         JavaCompiler.CompilationTask task = compiler.getTask(
@@ -88,7 +81,7 @@ private void compile(Processor processor, JavaFileObject... compilationUnits) th
 
     protected void assertGeneratedFileContent(String gemName, File generatedDir) {
         Path gemPath = generatedDir.toPath().resolve( "org/mapstruct/tools/gem/processor/" + gemName + ".java" );
-        softly.assertThat( gemPath )
+        assertThat( gemPath )
             .as( gemName )
             .exists();
 
@@ -96,7 +89,7 @@ protected void assertGeneratedFileContent(String gemName, File generatedDir) {
              InputStream expectedGemStream = getClass().getClassLoader()
                  .getResourceAsStream( "fixtures/org/mapstruct/tools/gem/processor/" + gemName + ".java" )
         ) {
-            softly.assertThat( generatedGemStream )
+            assertThat( generatedGemStream )
                 .as( gemName )
                 .hasSameContentAs( expectedGemStream );
         }
@@ -139,4 +132,12 @@ private String getSource() {
             "public class GemGenerator {\n" +
             "}";
     }
+
+    private static File newFolder(File root, String folder) throws IOException {
+        File result = new File(root, folder);
+        if (!result.mkdir()) {
+            throw new IOException("Couldn't create folder " + result);
+        }
+        return result;
+    }
 }