Increase number of allowed failures (unit tests).
diff --git a/commons-math-legacy/pom.xml b/commons-math-legacy/pom.xml
index 345d18f..8f86c23 100644
--- a/commons-math-legacy/pom.xml
+++ b/commons-math-legacy/pom.xml
@@ -132,7 +132,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <rerunFailingTestsCount>5</rerunFailingTestsCount>
+          <rerunFailingTestsCount>9</rerunFailingTestsCount>
         </configuration>
       </plugin>
       <!-- Ignore spotbugs in the legacy module.