diff --git a/build.gradle b/build.gradle
index 94327bfd..79512151 100644
--- a/build.gradle
+++ b/build.gradle
@@ -125,10 +125,12 @@ class Tags {
     }
 }
 
-ext.junit4Version        = '4.12'
-ext.junitVintageVersion  = '4.12.0-M2'
-ext.junitPlatformVersion = '1.0.0-M2'
-ext.junitJupiterVersion  = '5.0.0-M2'
+ext {
+    junit4Version        = '4.12'
+    junitVintageVersion  = '4.12.0-M2'
+    junitPlatformVersion = '1.0.0-M2'
+    junitJupiterVersion  = '5.0.0-M2'
+}
 
 subprojects {
     apply plugin: 'com.github.johnrengelman.shadow'
@@ -146,7 +148,7 @@ subprojects {
     }
 
     dependencies {
-        //compile 'junit:junit:4.12'
+        // compile 'junit:junit:4.12'
         compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.+'
         compile group: 'ch.qos.logback', name: 'logback-classic', version: '1.+'
         // You can also use the JDK's built-in logging as the back end:
@@ -159,11 +161,12 @@ subprojects {
         // If you also want to support JUnit 3 and JUnit 4 tests
         testCompile("junit:junit:${junit4Version}")
         testRuntime("org.junit.vintage:junit-vintage-engine:${junitVintageVersion}")*/
+        compile "org.junit.jupiter:junit-jupiter-api:5.0.0-M2"
         testCompile "org.junit.jupiter:junit-jupiter-api:5.0.0-M2"
         testRuntime "org.junit.jupiter:junit-jupiter-engine:5.0.0-M2"
-        testCompile "junit:junit:4.12"
+/*        testCompile "junit:junit:4.12"
         testRuntime "org.junit.vintage:junit-vintage-engine:4.12.0-M2"
-/*        compile "org.junit.jupiter:junit-jupiter-api:5.0.0-M2"
+*//*        compile "org.junit.jupiter:junit-jupiter-api:5.0.0-M2"
         compile "org.junit.vintage:junit-vintage-engine:4.12.0-M2"*/
     }
 
diff --git a/references/DeepCopy.java b/references/DeepCopy.java
index 0976d6dc..ba4db549 100644
--- a/references/DeepCopy.java
+++ b/references/DeepCopy.java
@@ -4,8 +4,8 @@
 // Visit http://mindviewinc.com/Books/OnJava/ for more book information.
 // Cloning a composed object
 // (Install libraries from junit.org)
-import org.junit.Test;
-import static org.junit.Assert.assertEquals;
+import org.junit.jupiter.api.*;
+import static org.junit.jupiter.api.Assertions.*;
 
 class DepthReading implements Cloneable {
   private double depth;
diff --git a/verifying/FirstJUnit5Tests.java b/verifying/FirstJUnit5Tests.java
index da6546a3..c4ced5d9 100644
--- a/verifying/FirstJUnit5Tests.java
+++ b/verifying/FirstJUnit5Tests.java
@@ -3,8 +3,8 @@
 // We make no guarantees that this code is fit for any purpose.
 // Visit http://mindviewinc.com/Books/OnJava/ for more book information.
 package verifying;
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.*;
+import static org.junit.jupiter.api.Assertions.*;
 
 class FirstJUnit5Tests {
     @Test
diff --git a/verifying/QueueTest.java b/verifying/QueueTest.java
index 5036b7f6..423cd66f 100644
--- a/verifying/QueueTest.java
+++ b/verifying/QueueTest.java
@@ -4,8 +4,8 @@
 // Visit http://mindviewinc.com/Books/OnJava/ for more book information.
 package verifying;
 import verifying.Queue;
-import org.junit.Test;
-import static org.junit.Assert.*;
+import org.junit.jupiter.api.*;
+import static org.junit.jupiter.api.Assertions.*;
 
 public class QueueTest {
   private Queue queue = new Queue(10);
diff --git a/verifying/SimpleJUnit.java b/verifying/SimpleJUnit.java
index 7d98eff7..a01aa36e 100644
--- a/verifying/SimpleJUnit.java
+++ b/verifying/SimpleJUnit.java
@@ -5,8 +5,8 @@
 // Simple use of JUnit to test ArrayList
 package verifying;
 import java.util.*;
-import org.junit.*;
-import static org.junit.Assert.*;
+import org.junit.jupiter.api.*;
+import static org.junit.jupiter.api.Assertions.*;
 
 // Keeps track of list objects as they are
 // created and cleaned up:
diff --git a/verifying/StringInverterTest.java b/verifying/StringInverterTest.java
index 30c1ebd2..76bd8a6b 100644
--- a/verifying/StringInverterTest.java
+++ b/verifying/StringInverterTest.java
@@ -4,10 +4,10 @@
 // Visit http://mindviewinc.com/Books/OnJava/ for more book information.
 // {ValidateByHand} // Don't run by itself
 import java.util.*;
-import org.junit.*;
-import static org.junit.Assert.*;
-import org.junit.runner.*;
-import org.junit.runner.notification.Failure;
+import org.junit.jupiter.api.*;
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.runner.*;
+import org.junit.jupiter.runner.notification.Failure;
 
 public class StringInverterTest {
   static StringInverter inverter;