diff --git a/src/test/java/org/openrewrite/java/testing/mockito/JunitMockitoUpgradeIntegrationTest.java b/src/test/java/org/openrewrite/java/testing/mockito/JunitMockitoUpgradeIntegrationTest.java
index 69fd31ecc..96fd54d36 100755
--- a/src/test/java/org/openrewrite/java/testing/mockito/JunitMockitoUpgradeIntegrationTest.java
+++ b/src/test/java/org/openrewrite/java/testing/mockito/JunitMockitoUpgradeIntegrationTest.java
@@ -118,6 +118,70 @@ public void usingAnnotationBasedMock() {
         );
     }
 
+    @Test
+    void removeOpenMocksWhenExtensionAddedDuringJUnit4to5Migration() {
+        //language=java
+        rewriteRun(
+          spec -> spec
+            .parser(JavaParser.fromJavaVersion()
+              .classpathFromResources(new InMemoryExecutionContext(), "mockito-core", "junit-4", "hamcrest-3", "junit-jupiter-api-5")),
+          java(
+            """
+              package org.openrewrite.java.testing.junit5;
+
+              import org.junit.Before;
+              import org.junit.Test;
+              import org.mockito.Mock;
+              import org.mockito.MockitoAnnotations;
+
+              import java.util.List;
+
+              import static org.mockito.Mockito.verify;
+
+              public class MockitoTests {
+                  @Mock
+                  List<String> mockedList;
+
+                  @Before
+                  public void initMocks() {
+                      MockitoAnnotations.openMocks(this);
+                  }
+
+                  @Test
+                  public void usingAnnotationBasedMock() {
+                      mockedList.add("one");
+                      verify(mockedList).add("one");
+                  }
+              }
+              """,
+            """
+              package org.openrewrite.java.testing.junit5;
+
+              import org.junit.jupiter.api.Test;
+              import org.junit.jupiter.api.extension.ExtendWith;
+              import org.mockito.Mock;
+              import org.mockito.junit.jupiter.MockitoExtension;
+
+              import java.util.List;
+
+              import static org.mockito.Mockito.verify;
+
+              @ExtendWith(MockitoExtension.class)
+              public class MockitoTests {
+                  @Mock
+                  List<String> mockedList;
+
+                  @Test
+                  public void usingAnnotationBasedMock() {
+                      mockedList.add("one");
+                      verify(mockedList).add("one");
+                  }
+              }
+              """
+          )
+        );
+    }
+
     /**
      * Mockito 1 used Matchers.anyVararg() to match the arguments to a variadic function.
      * Mockito 2+ uses Matchers.any() to match anything including the arguments to a variadic function.
diff --git a/src/test/java/org/openrewrite/java/testing/mockito/Mockito1to3MigrationTest.java b/src/test/java/org/openrewrite/java/testing/mockito/Mockito1to3MigrationTest.java
index 460c8b550..9215218da 100644
--- a/src/test/java/org/openrewrite/java/testing/mockito/Mockito1to3MigrationTest.java
+++ b/src/test/java/org/openrewrite/java/testing/mockito/Mockito1to3MigrationTest.java
@@ -287,6 +287,109 @@ void migratesCorrectlyWhenManagedDependency() {
         );
     }
 
+    @Test
+    void removeOpenMocksWhenExtensionAdded() {
+        rewriteRun(
+          spec -> spec.parser(JavaParser.fromJavaVersion()
+            .classpathFromResources(new InMemoryExecutionContext(), "junit-jupiter-api", "mockito-core", "mockito-junit-jupiter")),
+          //language=java
+          java(
+            """
+              import org.junit.jupiter.api.BeforeEach;
+              import org.junit.jupiter.api.Test;
+              import org.mockito.Mock;
+              import org.mockito.MockitoAnnotations;
+
+              class MyTest {
+                  @Mock
+                  Object myMock;
+
+                  @BeforeEach
+                  void setUp() {
+                      MockitoAnnotations.openMocks(this);
+                  }
+
+                  @Test
+                  void test() {
+                  }
+              }
+              """,
+            """
+              import org.junit.jupiter.api.Test;
+              import org.junit.jupiter.api.extension.ExtendWith;
+              import org.mockito.Mock;
+              import org.mockito.junit.jupiter.MockitoExtension;
+
+              @ExtendWith(MockitoExtension.class)
+              class MyTest {
+                  @Mock
+                  Object myMock;
+
+                  @Test
+                  void test() {
+                  }
+              }
+              """
+          )
+        );
+    }
+
+    @Test
+    void removeOpenMocksWithCloseableWhenExtensionAdded() {
+        rewriteRun(
+          spec -> spec.parser(JavaParser.fromJavaVersion()
+            .classpathFromResources(new InMemoryExecutionContext(), "junit-jupiter-api", "mockito-core", "mockito-junit-jupiter")),
+          //language=java
+          java(
+            """
+              import org.junit.jupiter.api.AfterEach;
+              import org.junit.jupiter.api.BeforeEach;
+              import org.junit.jupiter.api.Test;
+              import org.mockito.Mock;
+              import org.mockito.MockitoAnnotations;
+
+              class MyTest {
+                  private AutoCloseable mocks;
+
+                  @Mock
+                  Object myMock;
+
+                  @BeforeEach
+                  void setUp() {
+                      mocks = MockitoAnnotations.openMocks(this);
+                  }
+
+                  @AfterEach
+                  void tearDown() throws Exception {
+                      mocks.close();
+                  }
+
+                  @Test
+                  void test() {
+                  }
+              }
+              """,
+            """
+              import org.junit.jupiter.api.Test;
+              import org.junit.jupiter.api.extension.ExtendWith;
+              import org.mockito.Mock;
+              import org.mockito.junit.jupiter.MockitoExtension;
+
+              @ExtendWith(MockitoExtension.class)
+              class MyTest {
+
+                  @Mock
+                  Object myMock;
+
+                  @Test
+                  void test() {
+                  }
+              }
+              """
+          )
+        );
+    }
+
     @Test
     void handlesAnyObjectFromMockitoWildCardImport() {
         rewriteRun(