diff --git a/implementation/common/pom.xml b/implementation/common/pom.xml
old mode 100755
new mode 100644
index ae5bb53..16079ae
--- a/implementation/common/pom.xml
+++ b/implementation/common/pom.xml
@@ -115,7 +115,7 @@ FOL formulas, relation algebra, etc.
 		<dependency>
 			<groupId>org.apache.commons</groupId>
 			<artifactId>commons-collections4</artifactId>
-			<version>4.0</version>
+			<version>4.1</version>
 		</dependency>
 		<dependency>
 			<groupId>org.mockito</groupId>