diff --git a/CHANGELOG.md b/CHANGELOG.md
index 541c4a5..df157bc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,11 @@
 # CHANGELOG
 
 ## vx.x.x
+
+## v0.4.0
  - Make it possible to use locally installed yosys
+ - Use ruff for python formatting and linting of code
+ - Fix issue #3 (AttributeError when trying to delete objects)
 
 ## v0.3.1
  - Fix path in examples to work with github action
diff --git a/pyproject.toml b/pyproject.toml
index 21ac0f8..530e555 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "digsim-logic-simulator"
 description = "Interactive Digital Logic Simulator"
-version = "0.3.1"
+version = "0.4.0"
 authors = [{name = "Fredrik Andersson", email = "freand@gmail.com"}]
 maintainers =  [{name = "Fredrik Andersson", email = "freand@gmail.com"}]
 readme = "README.md"