diff --git a/pom.xml b/pom.xml
index 6c44211b3..0deeb3c3f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -244,12 +244,12 @@
                     <argLine>-Xmx${jvmMemory}m</argLine>
                     <testFailureIgnore>true</testFailureIgnore>
                     <rerunFailingTestsCount>1</rerunFailingTestsCount>
-                    <forkCount>3</forkCount>
+                    <forkCount>4</forkCount>
                     <includes>
                         <include>**/**.java</include>
                     </includes>
                     <parallel>methods</parallel>
-                    <threadCount>3</threadCount>
+                    <threadCount>4</threadCount>
                     <reuseForks>true</reuseForks>
                 </configuration>
             </plugin>
diff --git a/src/test/java/org/dvsa/testing/framework/parallel/CustomRunner.java b/src/test/java/org/dvsa/testing/framework/parallel/CustomRunner.java
index ee8b980d7..c57bf6bcc 100644
--- a/src/test/java/org/dvsa/testing/framework/parallel/CustomRunner.java
+++ b/src/test/java/org/dvsa/testing/framework/parallel/CustomRunner.java
@@ -7,7 +7,7 @@
 import java.util.concurrent.ForkJoinPool;
 import java.util.function.Predicate;
 public class CustomRunner implements ParallelExecutionConfiguration, ParallelExecutionConfigurationStrategy  {
-    private static final int FIXED_PARALLELISM = 3;
+    private static final int FIXED_PARALLELISM = 4;
 
     static {
         System.out.println("THREADS: " + FIXED_PARALLELISM);