diff --git a/java/pom.xml b/java/pom.xml
index 2a64eb3b79..2f98c82da8 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -58,7 +58,7 @@
     </developers>
 
     <packaging>jar</packaging>
-    <version>1.2.0</version>
+    <version>1.3.0-SNAPSHOT</version>
 
     <properties>
         <java.version>17</java.version>
diff --git a/pypowsybl/__init__.py b/pypowsybl/__init__.py
index 273085310d..5e0335f112 100644
--- a/pypowsybl/__init__.py
+++ b/pypowsybl/__init__.py
@@ -22,7 +22,7 @@
 )
 from pypowsybl.network import per_unit_view
 
-__version__ = '1.2.0'
+__version__ = '1.3.0.dev1'
 
 # set JVM java.library.path to pypowsybl module installation directory to be able to load math library
 _pypowsybl.set_java_library_path(_os.path.dirname(_inspect.getfile(_pypowsybl)))