diff --git a/cellbase-app/pom.xml b/cellbase-app/pom.xml
index a66c3db4b..a48a872cf 100644
--- a/cellbase-app/pom.xml
+++ b/cellbase-app/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.opencb.cellbase</groupId>
         <artifactId>cellbase</artifactId>
-        <version>6.3.0</version>
+        <version>4.0.0-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/cellbase-client/pom.xml b/cellbase-client/pom.xml
index 7fa9cf92f..10a99fbbf 100644
--- a/cellbase-client/pom.xml
+++ b/cellbase-client/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.opencb.cellbase</groupId>
         <artifactId>cellbase</artifactId>
-        <version>6.3.0</version>
+        <version>4.0.0-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/cellbase-core/pom.xml b/cellbase-core/pom.xml
index 08051e82c..5dbce2323 100644
--- a/cellbase-core/pom.xml
+++ b/cellbase-core/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.opencb.cellbase</groupId>
         <artifactId>cellbase</artifactId>
-        <version>6.3.0</version>
+        <version>4.0.0-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/cellbase-lib/pom.xml b/cellbase-lib/pom.xml
index 10076ad8d..0ab2566b4 100644
--- a/cellbase-lib/pom.xml
+++ b/cellbase-lib/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.opencb.cellbase</groupId>
         <artifactId>cellbase</artifactId>
-        <version>6.3.0</version>
+        <version>4.0.0-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/cellbase-server/pom.xml b/cellbase-server/pom.xml
index 02204b0cc..9494b30f0 100644
--- a/cellbase-server/pom.xml
+++ b/cellbase-server/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.opencb.cellbase</groupId>
         <artifactId>cellbase</artifactId>
-        <version>6.3.0</version>
+        <version>4.0.0-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/pom.xml b/pom.xml
index 6e035de53..b976538c0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>org.opencb.cellbase</groupId>
     <artifactId>cellbase</artifactId>
-    <version>6.3.0</version>
+    <version>4.0.0-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <name>CellBase project</name>