diff --git a/.gitignore b/.gitignore
index adb8c8a..f29fee0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,5 @@ TAGS
 env/
 env3/
 test/assets
+/build
+/dist
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f3fefdc..0590fbe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,10 +4,13 @@ Versioned according to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
+## [0.4.0] - 2020-08-21
+
 Changed:
 
   * adapt to 1-output-file-group convention, use `make_file_id` and `assert_file_grp_cardinality`, #17
   * set pcGtsId to file ID, #17
 
 <!-- link-labels -->
+[0.4.0]: ../../compare/v0.4.0...v0.3.1
 [0.3.1]: ../../compare/HEAD...v0.3.1
diff --git a/ocrd_keraslm/wrapper/ocrd-tool.json b/ocrd_keraslm/wrapper/ocrd-tool.json
index b06cc2d..db9d381 100644
--- a/ocrd_keraslm/wrapper/ocrd-tool.json
+++ b/ocrd_keraslm/wrapper/ocrd-tool.json
@@ -1,6 +1,6 @@
 {
   "git_url": "https://github.com/OCR-D/ocrd_keraslm",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "tools": {
     "ocrd-keraslm-rate": {
       "executable": "ocrd-keraslm-rate",
diff --git a/setup.py b/setup.py
index b39fe19..a8ceb31 100644
--- a/setup.py
+++ b/setup.py
@@ -5,15 +5,18 @@
     - ocrd-keraslm-rate
 """
 import codecs
+import json
 
 from setuptools import setup, find_packages
 
 with codecs.open('README.md', encoding='utf-8') as f:
     README = f.read()
+with open('ocrd-tool.json', 'r') as f:
+    version = json.load(f)['version']
 
 setup(
     name='ocrd_keraslm',
-    version='0.3.2',
+    version=version,
     description='character-level language modelling in Keras',
     long_description=README,
     long_description_content_type='text/markdown',