diff --git a/pom.xml b/pom.xml
index e52c486..035e47c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -149,13 +149,13 @@
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-core</artifactId>
-            <version>2.15.0</version>
+            <version>2.17.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-inline</artifactId>
-            <version>2.15.0</version>
+            <version>2.17.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>
diff --git a/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorOfflineTest.java b/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorOfflineTest.java
index 1b1ffcc..046be8b 100644
--- a/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorOfflineTest.java
+++ b/src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorOfflineTest.java
@@ -62,7 +62,6 @@ import static org.mockito.Mockito.*;
 public class HTTPVaultConnectorOfflineTest {
     private static final String INVALID_URL = "foo:/\\1nv4l1d_UrL";
 
-    private static HttpClientBuilder httpMockBuilder = mock(HttpClientBuilder.class);
     private static CloseableHttpClient httpMock = mock(CloseableHttpClient.class);
     private CloseableHttpResponse responseMock = mock(CloseableHttpResponse.class);
 
@@ -78,7 +77,7 @@ public class HTTPVaultConnectorOfflineTest {
      * @return Mocked HTTP client builder.
      */
     public static HttpClientBuilder create() {
-        return httpMockBuilder;
+        return new MockedHttpClientBuilder();
     }
 
     @BeforeEach
@@ -90,14 +89,8 @@ public class HTTPVaultConnectorOfflineTest {
                 .make()
                 .load(HttpClientBuilder.class.getClassLoader(), ClassReloadingStrategy.fromInstalledAgent());
 
-        // Ignore SSL context settings.
-        when(httpMockBuilder.setSSLSocketFactory(any())).thenReturn(httpMockBuilder);
-
         // Re-initialize HTTP mock to ensure fresh (empty) results.
         httpMock = mock(CloseableHttpClient.class);
-
-        // Mock actual client creation.
-        when(httpMockBuilder.build()).thenReturn(httpMock);
     }
 
     /**
@@ -486,4 +479,15 @@ public class HTTPVaultConnectorOfflineTest {
         when(responseMock.getStatusLine()).thenReturn(new BasicStatusLine(new ProtocolVersion("HTTP", 1, 1), status, ""));
         when(responseMock.getEntity()).thenReturn(new StringEntity(body, type));
     }
+
+    /**
+     * Mocked {@link HttpClientBuilder} that always returns the mocked client.
+     */
+    private static class MockedHttpClientBuilder extends HttpClientBuilder {
+        @Override
+        public CloseableHttpClient build() {
+            return httpMock;
+        }
+    }
+
 }