diff --git a/VERSION b/VERSION
index 0d91a54c..1d0ba9ea 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.3.0
+0.4.0
diff --git a/setup.cfg b/setup.cfg
index b992172f..15886bcb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.3.0
+current_version = 0.4.0
 commit = True
 tag = True
 
diff --git a/setup.py b/setup.py
index 2dbc125f..dec1c323 100644
--- a/setup.py
+++ b/setup.py
@@ -50,6 +50,6 @@
     test_suite='tests',
     tests_require=test_requirements,
     url='https://github.com/jeandet/spwc',
-    version='0.3.0',
+    version='0.4.0',
     zip_safe=False,
 )
diff --git a/spwc/__init__.py b/spwc/__init__.py
index 523a585f..9901668e 100644
--- a/spwc/__init__.py
+++ b/spwc/__init__.py
@@ -4,7 +4,7 @@
 
 __author__ = """Alexis Jeandet"""
 __email__ = 'alexis.jeandet@member.fsf.org'
-__version__ = '0.3.0'
+__version__ = '0.4.0'
 from .common.variable import SpwcVariable
 from .amda import AMDA
 from .cdaweb import cdaweb as cd