Un update dependencies dans Eclipse enlève la JRE du projet

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://maven.apache.org/POM/4.0.0
        http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.archedeternite</groupId>
  <artifactId>archedeternite-parent</artifactId>
  <version>1.0.0</version>
  <packaging>pom</packaging>
 
 <modules>
    <module>entity</module>
  </modules>
 
     <build>
      <plugins>
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
               <source>1.6</source>
               <target>1.6</target>
            </configuration>
         </plugin>
      </plugins>
   </build>
</project>