diff --git a/jenkins-client/src/test/java/com/offbytwo/jenkins/client/JenkinsHttpClientTest.java b/jenkins-client/src/test/java/com/offbytwo/jenkins/client/JenkinsHttpClientTest.java
index 80f3ba38..2e3bce09 100644
--- a/jenkins-client/src/test/java/com/offbytwo/jenkins/client/JenkinsHttpClientTest.java
+++ b/jenkins-client/src/test/java/com/offbytwo/jenkins/client/JenkinsHttpClientTest.java
@@ -5,6 +5,12 @@
  */
 package com.offbytwo.jenkins.client;
 
+import static org.junit.Assert.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+
 import java.io.ByteArrayInputStream;
 import java.net.URI;
 import org.apache.http.Header;
@@ -15,12 +21,7 @@
 import org.apache.http.client.methods.HttpUriRequest;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.protocol.HttpContext;
-import static org.junit.Assert.assertEquals;
 import org.junit.Test;
-import static org.mockito.BDDMockito.given;
-import static org.mockito.Matchers.any;
-import static org.mockito.Matchers.anyString;
-import static org.mockito.Mockito.mock;
 
 
 
@@ -30,7 +31,7 @@
  */
 public class JenkinsHttpClientTest {
     private static final String URI = "http://localhost/jenkins";
-    
+
 
 
     @Test
@@ -40,8 +41,8 @@ public void testGet_String() throws Exception {
         final Header versionHeader = mock(Header.class);
         final StatusLine statusLine = mock(StatusLine.class);
         final HttpEntity entity = mock(HttpEntity.class);
-        given(client.execute(any(HttpUriRequest.class), any(HttpContext.class))).willReturn(response);
-        given(response.getHeaders(anyString())).willReturn(new Header[]{versionHeader});
+        given(client.execute(any(HttpUriRequest.class), eq((HttpContext)null))).willReturn(response);
+        given(response.getHeaders("X-Jenkins")).willReturn(new Header[]{versionHeader});
         given(response.getStatusLine()).willReturn(statusLine);
         given(versionHeader.getValue()).willReturn("1.234");
         given(statusLine.getStatusCode()).willReturn(HttpStatus.SC_OK);
@@ -51,15 +52,15 @@ public void testGet_String() throws Exception {
         final String s = jclient.get("job/someJob");
         assertEquals("someJson", s);
     }
-    
-    
-    
+
+
+
     @Test(expected=IllegalStateException.class)
     public void testClose() throws Exception {
         final JenkinsHttpConnection jclient = new JenkinsHttpClient(new URI(URI));
         jclient.close();
         jclient.close(); //check multiple calls yield no errors
-        jclient.get("job/someJob");       
+        jclient.get("job/someJob");
     }
 
 
diff --git a/pom.xml b/pom.xml
index ffa639db..68704676 100644
--- a/pom.xml
+++ b/pom.xml
@@ -53,7 +53,7 @@
     <!-- Version of Jenkins to use for Integration Tests -->
     <jenkins-version>1.644</jenkins-version>
     <junit.version>4.12</junit.version>
-    <mockito-core.version>1.9.5</mockito-core.version>
+    <mockito-core.version>3.0.0</mockito-core.version>
     <commons-io.version>2.4</commons-io.version>
     <xstream.version>1.4.7-jenkins-1</xstream.version>
     <dom4j.version>1.6.1</dom4j.version>
@@ -166,33 +166,35 @@
         <groupId>org.testng</groupId>
         <artifactId>testng</artifactId>
         <version>7.0.0</version>
-        <scope>test</scope>
+      </dependency>
+      <dependency>
+        <groupId>org.junit</groupId>
+        <artifactId>junit-bom</artifactId>
+        <version>5.5.2</version>
+        <scope>import</scope>
+        <type>pom</type>
       </dependency>
       <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
         <version>${junit.version}</version>
-        <scope>test</scope>
       </dependency>
 
       <dependency>
         <groupId>org.mockito</groupId>
         <artifactId>mockito-core</artifactId>
         <version>${mockito-core.version}</version>
-        <scope>test</scope>
       </dependency>
 
       <dependency>
         <groupId>org.jenkins-ci.main</groupId>
         <artifactId>jenkins-test-harness</artifactId>
         <version>${jenkins-version}</version>
-        <scope>test</scope>
       </dependency>
       <dependency>
         <groupId>org.assertj</groupId>
         <artifactId>assertj-core</artifactId>
         <version>3.12.2</version>
-        <scope>test</scope>
       </dependency>
 
       <dependency>
@@ -202,13 +204,10 @@
       </dependency>
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
-        <artifactId>log4j-core</artifactId>
-        <version>2.11.1</version>
-      </dependency>
-      <dependency>
-        <groupId>org.apache.logging.log4j</groupId>
-        <artifactId>log4j-slf4j-impl</artifactId>
-        <version>2.11.1</version>
+        <artifactId>log4j-bom</artifactId>
+        <version>2.12.1</version>
+        <scope>import</scope>
+        <type>pom</type>
       </dependency>
       <dependency>
         <groupId>xml-apis</groupId>