diff --git a/java/pom.xml b/java/pom.xml
index 9f93acd56..b576af8c7 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -22,7 +22,7 @@
     <artifactId>pypowsybl-parent</artifactId>
 
     <packaging>pom</packaging>
-    <version>1.9.0</version>
+    <version>1.10.0-SNAPSHOT</version>
     <description>PyPowSyBl Java part parent project</description>
     <url>https://www.powsybl.org</url>
 
diff --git a/pypowsybl/__init__.py b/pypowsybl/__init__.py
index d9144f1e5..11fc931d8 100644
--- a/pypowsybl/__init__.py
+++ b/pypowsybl/__init__.py
@@ -23,7 +23,7 @@
 )
 from pypowsybl.network import per_unit_view
 
-__version__ = '1.9.0'
+__version__ = '1.10.0.dev1'
 
 # set JVM java.library.path to pypowsybl module installation directory to be able to load native libraries
 _pypowsybl.set_java_library_path(_os.path.dirname(_inspect.getfile(_pypowsybl)))