diff --git a/Mustang-CLI/pom.xml b/Mustang-CLI/pom.xml
index 68c9cdb6..aaf4986f 100644
--- a/Mustang-CLI/pom.xml
+++ b/Mustang-CLI/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.mustangproject</groupId>
         <artifactId>core</artifactId>
-        <version>2.13.0</version>
+        <version>2.13.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>Mustang-CLI</artifactId>
diff --git a/library/pom.xml b/library/pom.xml
index 27f24771..66684cac 100644
--- a/library/pom.xml
+++ b/library/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.mustangproject</groupId>
         <artifactId>core</artifactId>
-        <version>2.13.0</version>
+        <version>2.13.0-SNAPSHOT</version>
     </parent>
     <artifactId>library</artifactId>
     <packaging>jar</packaging>
@@ -207,7 +207,7 @@
                         <phase>package</phase>
                         <configuration>
                             <artifactSet>
-                                <excludes />
+                                <excludes></excludes>
                             </artifactSet>
                         </configuration>
                     </execution>
diff --git a/pom.xml b/pom.xml
index 7626a32c..9355edf7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.mustangproject</groupId>
     <artifactId>core</artifactId>
-    <version>2.13.0</version>
+    <version>2.13.0-SNAPSHOT</version>
     <packaging>pom</packaging>
     <name>Mustang</name>
 
@@ -83,8 +83,7 @@
         <connection>scm:git:https://github.com/ZUGFeRD/mustangproject.git</connection>
         <developerConnection>scm:git:https://github.com/ZUGFeRD/mustangproject.git</developerConnection>
         <url>https://github.com/ZUGFeRD/mustangproject</url>
-      <tag>core-2.13.0</tag>
-  </scm>
+    </scm>
 
     <distributionManagement>
         <repository>
@@ -248,7 +247,7 @@
 	                        <phase>package</phase>
 	                        <configuration>
 	                            <artifactSet>
-	                                <excludes />
+	                                <excludes></excludes>
 	                            </artifactSet>
 	                        </configuration>
 	                    </execution>
diff --git a/validator/pom.xml b/validator/pom.xml
index 904ef552..f3f3a95a 100644
--- a/validator/pom.xml
+++ b/validator/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.mustangproject</groupId>
         <artifactId>core</artifactId>
-        <version>2.13.0</version>
+        <version>2.13.0-SNAPSHOT</version>
     </parent>
     
     <artifactId>validator</artifactId>