diff --git a/.settings/.gitignore b/.settings/.gitignore
new file mode 100644
index 0000000..b012ade
--- /dev/null
+++ b/.settings/.gitignore
@@ -0,0 +1 @@
+/org.eclipse.core.resources.prefs
diff --git a/pom.xml b/pom.xml
index fb6f31b..451c0cd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -649,6 +649,7 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-enforcer-plugin</artifactId>
+					<version>${maven-enforcer-plugin-version}</version>
 					<executions>
 						<execution>
 							<id>enforce</id>
@@ -698,6 +699,7 @@
 									<pluginExecutionFilter>
 										<groupId>org.apache.maven.plugins</groupId>
 										<artifactId>maven-enforcer-plugin</artifactId>
+										<version>${maven-enforcer-plugin-version}</version>
 										<goals>
 											<goal>enforce</goal>
 										</goals>
@@ -772,14 +774,12 @@
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>buildnumber-maven-plugin</artifactId>
-                <version>1.4</version>
             </plugin>
 
 			<!-- enforce integration build requirements -->
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-enforcer-plugin</artifactId>
-				<version>3.0.0-M3</version>
 				<executions>
 					<execution>
 						<id>enforce-files-exist</id>
@@ -889,6 +889,8 @@
 
 		<repository.externals.readonly>http://maven.research-infrastructures.eu/nexus/content/repositories/gcube-externals</repository.externals.readonly>
 
+		<maven-enforcer-plugin-version>3.0.0-M3</maven-enforcer-plugin-version>
+
 		<!-- following properties contains common information on gCube that are used for filtering resources like README, LICENSE, ... -->
 
 		<gcube.wikiRoot>https://wiki.gcube-system.org/gcube/index.php</gcube.wikiRoot>