diff --git a/README.md b/README.md
index aa72035b..cbd38bb6 100644
--- a/README.md
+++ b/README.md
@@ -176,6 +176,7 @@ the parameter.
 
 - IoUtil.closeAll()
 - code cleanup
+- prevent serialization of logging related classes for security reasons
 - javadoc
 
 ### 13.1.1
diff --git a/settings.gradle.kts b/settings.gradle.kts
index a53b345b..705b2ca8 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -1,6 +1,6 @@
 // define project name and version
 rootProject.name = "dua3-utility"
-val projectVersion = "13.1.2-SNAPSHOT"
+val projectVersion = "13.1.2"
 
 // define subprojects
 include("utility")