diff --git a/CHANGELOGS.md b/CHANGELOGS.md
index 3e19efd..3499f50 100644
--- a/CHANGELOGS.md
+++ b/CHANGELOGS.md
@@ -1,5 +1,10 @@
 # Changelogs
 
+## 0.4.0
+
+ * Support two abort mode. `cancel` to cancel the pending task, and the default
+   `abort` to abort either pending or running task. (#7)
+
 ## 0.3.1
 
  * Add `gevent` support  (@FinnLidbetter, #12)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ab1e79a..7860c64 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -25,3 +25,19 @@ tox
 ```
 
 Successful `tox` run is a prerequisite for a Pull Request to be merged.
+
+# Release Guide
+
+Build source and wheel package.
+
+```
+python -m build --sdist
+python -m build --wheel
+```
+
+Publish package:
+
+```
+twine check dist/*
+twine upload dist/*
+```
diff --git a/setup.py b/setup.py
index 6fd3354..eed044b 100644
--- a/setup.py
+++ b/setup.py
@@ -66,6 +66,10 @@ def rel(*xs: str) -> str:
     # Docs
     "sphinx",
     "sphinx-autodoc-typehints",
+    # Build
+    "build",
+    "wheel",
+    "twine",
 ]
 
 setup(
diff --git a/src/dramatiq_abort/__init__.py b/src/dramatiq_abort/__init__.py
index 980094f..dbbbb6e 100644
--- a/src/dramatiq_abort/__init__.py
+++ b/src/dramatiq_abort/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.3.1"
+__version__ = "0.4.0"
 
 from .backend import EventBackend
 from .middleware import Abort, Abortable, abort