diff --git a/pom.xml b/pom.xml
index 403aff6..8c8d7f2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -37,6 +37,7 @@
     <jenkins.baseline>2.479</jenkins.baseline>
     <jenkins.version>${jenkins.baseline}.3</jenkins.version>
     <gitHubRepo>jenkinsci/${project.artifactId}-plugin</gitHubRepo>
+    <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
   </properties>
 
   <dependencyManagement>
diff --git a/src/test/java/org/jenkinsci/plugins/structs/SymbolLookupAnticacheTest.java b/src/test/java/org/jenkinsci/plugins/structs/SymbolLookupAnticacheTest.java
index a5adb60..d7fbd79 100644
--- a/src/test/java/org/jenkinsci/plugins/structs/SymbolLookupAnticacheTest.java
+++ b/src/test/java/org/jenkinsci/plugins/structs/SymbolLookupAnticacheTest.java
@@ -3,43 +3,46 @@
 import hudson.model.Descriptor;
 import jenkins.tasks.SimpleBuildStep;
 import org.jenkinsci.plugins.structs.symbolLookupAnticacheTest.TrivialBuilder;
-import org.junit.Rule;
-import org.junit.Test;
-import org.jvnet.hudson.test.RealJenkinsRule;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+import org.jvnet.hudson.test.junit.jupiter.RealJenkinsExtension;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
 
 /**
  * @author Sam Van Oort
  */
-public class SymbolLookupAnticacheTest {
+class SymbolLookupAnticacheTest {
 
-    @Rule public RealJenkinsRule rjr = new RealJenkinsRule();
+    @RegisterExtension
+    private final RealJenkinsExtension rjr = new RealJenkinsExtension();
 
     /** Verify that if we install a new plugin with a Symbol use, that symbol is found.
      *  Without the plugin we hit the "anticache" i.e. {@link SymbolLookup#noHitCache} that the symbol does not exist.
      *  Once we add the plugin it should hit the cache.
      */
-    @Test public void testAnticache() throws Throwable {
-        var plugin = rjr.createSyntheticPlugin(new RealJenkinsRule.SyntheticPlugin(TrivialBuilder.class).shortName("SymbolLookupAnticacheTest").header("Plugin-Dependencies", "structs:0"));
+    @Test
+    void testAnticache() throws Throwable {
+        var plugin = rjr.createSyntheticPlugin(new RealJenkinsExtension.SyntheticPlugin(TrivialBuilder.class).shortName("SymbolLookupAnticacheTest").header("Plugin-Dependencies", "structs:0"));
         rjr.then(rule -> {
-        Descriptor d = SymbolLookup.get().findDescriptor(SimpleBuildStep.class, "trivialBuilder");
-        Descriptor stepDescriptor = SymbolLookup.get().find(Descriptor.class, "trivialBuilder");
-        assertNull(d);
-        assertNull(stepDescriptor);
-
-        rule.jenkins.getPluginManager().dynamicLoad(plugin);
-
-        d = SymbolLookup.get().findDescriptor(SimpleBuildStep.class, "trivialBuilder");
-        stepDescriptor = SymbolLookup.get().find(Descriptor.class, "trivialBuilder");
-        assertNotNull(d);
-        assertNotNull(stepDescriptor);
-        assertEquals("simpleBuild", d.getDisplayName());
-        assertEquals("TrivialBuilder", stepDescriptor.clazz.getSimpleName());
-
-        // Once more just to confirm there's no wackiness when hitting the normal cache too
-        assertEquals(SymbolLookup.get().findDescriptor(SimpleBuildStep.class, "trivialBuilder"), d);
+            Descriptor d = SymbolLookup.get().findDescriptor(SimpleBuildStep.class, "trivialBuilder");
+            Descriptor stepDescriptor = SymbolLookup.get().find(Descriptor.class, "trivialBuilder");
+            assertNull(d);
+            assertNull(stepDescriptor);
+
+            rule.jenkins.getPluginManager().dynamicLoad(plugin);
+
+            d = SymbolLookup.get().findDescriptor(SimpleBuildStep.class, "trivialBuilder");
+            stepDescriptor = SymbolLookup.get().find(Descriptor.class, "trivialBuilder");
+            assertNotNull(d);
+            assertNotNull(stepDescriptor);
+            assertEquals("simpleBuild", d.getDisplayName());
+            assertEquals("TrivialBuilder", stepDescriptor.clazz.getSimpleName());
+
+            // Once more just to confirm there's no wackiness when hitting the normal cache too
+            assertEquals(SymbolLookup.get().findDescriptor(SimpleBuildStep.class, "trivialBuilder"), d);
         });
     }