diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 218393f..4cff5b9 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.4.1"
+  ".": "0.4.2"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 61a48f4..63ef936 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [0.4.2](https://github.com/s2-streamstore/s2-sdk-python/compare/v0.4.1...v0.4.2) (2026-06-13)
+
+
+### Bug Fixes
+
+* incorrect ack deadline semantics in append session  ([#64](https://github.com/s2-streamstore/s2-sdk-python/issues/64)) ([248e5c0](https://github.com/s2-streamstore/s2-sdk-python/commit/248e5c0b1a2776edcd59783826feee34842651d8))
+* unawaited `asyncio.Task` cancellations  ([#78](https://github.com/s2-streamstore/s2-sdk-python/issues/78)) ([4d4ac80](https://github.com/s2-streamstore/s2-sdk-python/commit/4d4ac8022ec4b773dff506b0f0cbec220906ec67))
+
 ## [0.4.1](https://github.com/s2-streamstore/s2-sdk-python/compare/v0.4.0...v0.4.1) (2026-06-09)
 
 
diff --git a/docs/source/conf.py b/docs/source/conf.py
index bbee96c..d999240 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -10,7 +10,7 @@
 
 project = "s2-sdk"
 copyright = f"{date.today().year}, Bandar Systems Inc"
-release = "0.4.1"  # x-release-please-version
+release = "0.4.2"  # x-release-please-version
 
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
diff --git a/pyproject.toml b/pyproject.toml
index 7eafcb7..281099b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "s2-sdk"
-version = "0.4.1"
+version = "0.4.2"
 description = "Python SDK for s2.dev"
 readme = "README.md"
 license = "MIT"