diff --git a/CausalitySearch/pom.xml b/CausalitySearch/pom.xml
index dfd41c0..2b8b184 100644
--- a/CausalitySearch/pom.xml
+++ b/CausalitySearch/pom.xml
@@ -56,7 +56,7 @@
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-collections4</artifactId>
-            <version>4.0</version>
+            <version>4.1</version>
         </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>