diff --git a/example-4x/pom.xml b/example-4x/pom.xml
old mode 100755
new mode 100644
index d72724e..c13f68f
--- a/example-4x/pom.xml
+++ b/example-4x/pom.xml
@@ -12,7 +12,7 @@
 
 		<!-- Libraries versions -->
 		<cassandra.driver.oss.version>4.13.0</cassandra.driver.oss.version>
-		<logback.version>1.2.3</logback.version>
+		<logback.version>1.3.12</logback.version>
 
 		<!-- Project properties -->
 		<java.version>11</java.version>