diff --git a/meshkernel/version.py b/meshkernel/version.py
index 7de3f1f7..c78d9a61 100644
--- a/meshkernel/version.py
+++ b/meshkernel/version.py
@@ -1,5 +1,5 @@
 # MeshKernelPy version
-__version__ = "3.0.0"
+__version__ = "4.0.0"
 
 # MeshKernel version
-__backend_version__ = "3.0.0"
+__backend_version__ = "4.0.0"