diff --git a/distro/changelog.xml b/distro/changelog.xml
index 1f177d6..1b0c6c1 100644
--- a/distro/changelog.xml
+++ b/distro/changelog.xml
@@ -1,3 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE xml>
 <ReleaseNotes>
 	<Changeset component="org.gcube.information-system.resource-registry-orientdb-hooks.1-0-0" date="${buildDate}">
 		<Change>First Release</Change>	
diff --git a/distro/descriptor.xml b/distro/descriptor.xml
index 089683d..2f600d7 100644
--- a/distro/descriptor.xml
+++ b/distro/descriptor.xml
@@ -1,7 +1,7 @@
 <assembly
-	xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
+	xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0 http://maven.apache.org/xsd/assembly-1.1.0.xsd">
+	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
 	<id>servicearchive</id>
 	<formats>
 		<format>tar.gz</format>
diff --git a/distro/profile.xml b/distro/profile.xml
index 014ca47..4074c9c 100644
--- a/distro/profile.xml
+++ b/distro/profile.xml
@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE xml>
 <Resource>
 	<ID />
 	<Type>Service</Type>
diff --git a/src/test/resources/logback-test.xml b/src/test/resources/logback-test.xml
index d71fde3..1aadd48 100644
--- a/src/test/resources/logback-test.xml
+++ b/src/test/resources/logback-test.xml
@@ -1,3 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE xml>
 <configuration>
 
   <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">