diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 0959afb..87efea2 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.3.0
+current_version = 0.4.0
 commit = True
 tag = True
 
diff --git a/annotation/__init__.py b/annotation/__init__.py
index d1fdb8a..5e999f2 100644
--- a/annotation/__init__.py
+++ b/annotation/__init__.py
@@ -1,6 +1,6 @@
 import sys
 
-VERSION = '0.3.0'
+VERSION = '0.4.0'
 
 
 def report_errors(errors, samples):
diff --git a/setup.py b/setup.py
index 7bcb01e..91bbd4b 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 
 setup(
     name='reat',
-    version='0.3.0',
+    version='0.4.0',
     packages=find_packages('.', exclude=["tests"]),
     url='https://github.com/ei-corebioinformatics/reat',
     classifiers=[
diff --git a/singularity/build_image.sh b/singularity/build_image.sh
index cd84ecd..16e995d 100644
--- a/singularity/build_image.sh
+++ b/singularity/build_image.sh
@@ -1,5 +1,5 @@
 set -euxo
-version=0.3.0
+version=0.4.0
 rundir=$(dirname "$(realpath "$0")")
 cd "$(mktemp -d)"
 cp "${rundir}"/reat_singularity.def reat.def