diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index bd7f384..ca2c4e6 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.2.0"
+  ".": "4.2.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d76189d..9da83fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [4.2.1](https://github.com/coingecko/coingecko-python/compare/v4.2.0...v4.2.1) (2026-10-02)
+
+
+### Bug Fixes
+
+* Add missing launchpad_details fields ([0076d8f](https://github.com/coingecko/coingecko-python/commit/0076d8f556eb29cb7362a3689628d4ed69c91b17))
+
 ## [4.2.0](https://github.com/coingecko/coingecko-python/compare/v4.1.0...v4.2.0) (2026-09-28)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 46c0077..eb01b4a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "coingecko_sdk"
-version = "4.2.0"
+version = "4.2.1"
 description = "The official Python library for the coingecko API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/coingecko_sdk/_version.py b/src/coingecko_sdk/_version.py
index ec46756..938dfd1 100644
--- a/src/coingecko_sdk/_version.py
+++ b/src/coingecko_sdk/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "coingecko_sdk"
-__version__ = "4.2.0"  # x-release-please-version
+__version__ = "4.2.1"  # x-release-please-version