diff --git a/jsprit-analysis/pom.xml b/jsprit-analysis/pom.xml
index 8a89c40a..0190260d 100644
--- a/jsprit-analysis/pom.xml
+++ b/jsprit-analysis/pom.xml
@@ -22,7 +22,7 @@
   <parent>
   	<groupId>jsprit</groupId>
   	<artifactId>jsprit</artifactId>
-  	<version>1.3.1</version>
+  	<version>1.3.1-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>jsprit-analysis</artifactId>
diff --git a/jsprit-core/pom.xml b/jsprit-core/pom.xml
index fedc71d5..c26f1168 100644
--- a/jsprit-core/pom.xml
+++ b/jsprit-core/pom.xml
@@ -3,7 +3,7 @@
   <parent>
   	<groupId>jsprit</groupId>
   	<artifactId>jsprit</artifactId>
-  	<version>1.3.1</version>
+  	<version>1.3.1-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>jsprit-core</artifactId>
diff --git a/jsprit-examples/pom.xml b/jsprit-examples/pom.xml
index c0055750..205c96bb 100644
--- a/jsprit-examples/pom.xml
+++ b/jsprit-examples/pom.xml
@@ -3,7 +3,7 @@
   <parent>
   	<groupId>jsprit</groupId>
   	<artifactId>jsprit</artifactId>
-  	<version>1.3.1</version>
+  	<version>1.3.1-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   
diff --git a/jsprit-instances/pom.xml b/jsprit-instances/pom.xml
index b8bc3629..6f353c27 100644
--- a/jsprit-instances/pom.xml
+++ b/jsprit-instances/pom.xml
@@ -3,7 +3,7 @@
   <parent>
   	<groupId>jsprit</groupId>
   	<artifactId>jsprit</artifactId>
-  	<version>1.3.1</version>
+  	<version>1.3.1-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
  
diff --git a/pom.xml b/pom.xml
index 05984308..2ae66c3f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   
   <groupId>jsprit</groupId>
   <artifactId>jsprit</artifactId>
-  <version>1.3.1</version>
+  <version>1.3.1-SNAPSHOT</version>
   
   <packaging>pom</packaging>
   
@@ -35,7 +35,7 @@
   	<connection>scm:git:git@github.com:jsprit/jsprit.git</connection>
   	<developerConnection>scm:git:https://github.com/jsprit/jsprit.git</developerConnection>
   	<url>http://github.com/jsprit/jsprit/tree/master</url>
-  	<tag>v1.3.1</tag>
+  	<tag>HEAD</tag>
   </scm>
   
   <issueManagement>