diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad814fbfd..12f30f0fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,14 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 <!-- These are the changes that were not release yet, please add them correctly.
 Attention: The newest changes should be on top -->
 
+## [1.3.0.post1] - 2024-06-02
+
+You can install this version by running `pip install rocketpy==1.3.0.post1`
+
+### Fixed
+
+- BUG: pyproject.toml Main Module Finding. [#616](https://github.com/RocketPy-Team/RocketPy/pull/616)
+
 ## [1.3.0] - 2024-06-01
 
 You can install this version by running `pip install rocketpy==1.3.0`
diff --git a/docs/conf.py b/docs/conf.py
index 8fd2cde99..12fd89202 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -25,7 +25,7 @@
 author = "RocketPy Team"
 
 # The full version, including alpha/beta/rc tags
-release = "1.3.0"
+release = "1.3.0.post1"
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/docs/user/installation.rst b/docs/user/installation.rst
index ef9cf2ebc..f73310dfe 100644
--- a/docs/user/installation.rst
+++ b/docs/user/installation.rst
@@ -19,7 +19,7 @@ If you want to choose a specific version to guarantee compatibility, you may ins
 
 .. code-block:: shell
 
-    pip install rocketpy==1.3.0
+    pip install rocketpy==1.3.0.post1
 
 
 Optional Installation Method: ``conda``
diff --git a/pyproject.toml b/pyproject.toml
index ccb5eb6cc..623be535d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "rocketpy"
-version = "1.3.0"
+version = "1.3.0.post1"
 description="Advanced 6-DOF trajectory simulation for High-Power Rocketry."
 dynamic = ["dependencies"]
 readme = "README.md"
@@ -20,11 +20,11 @@ documentation = "https://docs.rocketpy.org/"
 repository = "https://github.com/RocketPy-Team/RocketPy"
 
 [build-system]
-requires = ["setuptools"]
+requires = ["setuptools>=42", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools]
-py-modules = ['rocketpy']
+packages = { find = { where = ["."], include = ["rocketpy*"] } }
 
 [tool.setuptools.dynamic]
 dependencies = { file = ["requirements.txt"] }