diff -r 4ea5dea84db6 -r de0d488a0a1b server/java/renkan-core/pom.xml
--- a/server/java/renkan-core/pom.xml	Fri Oct 02 13:03:19 2015 +0200
+++ b/server/java/renkan-core/pom.xml	Fri Oct 02 13:45:40 2015 +0200
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.iri_research.renkan</groupId>
         <artifactId>renkan</artifactId>
-        <version>0.7.11</version>
+        <version>0.12.11</version>
     </parent>
     <artifactId>renkan-core</artifactId>
     <name>renkan-core</name>
@@ -28,6 +28,7 @@
         <commons-collections-version>4.0</commons-collections-version>
         <junit-version>4.11</junit-version>
         <slf4j-log4j12-version>1.7.5</slf4j-log4j12-version>
+        <maven-compiler-plugin-version>3.3</maven-compiler-plugin-version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
     <repositories>
@@ -60,7 +61,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.1</version>
+                <version>${maven-compiler-plugin-version}</version>
                 <configuration>
                     <source>1.7</source>
                     <target>1.7</target>