diff --git a/README.md b/README.md
index 8018e68..c7ed744 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ dependencies = ["numpy"]
 dynamic = ["version", "description"]
 
 [build-system] # How pip and other frontends should build this project
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
 
 [tool.py-build-cmake.module] # Where to find the Python module to package
diff --git a/examples/minimal-debug-component/debug/pyproject.toml b/examples/minimal-debug-component/debug/pyproject.toml
index 06897d7..7c785c9 100644
--- a/examples/minimal-debug-component/debug/pyproject.toml
+++ b/examples/minimal-debug-component/debug/pyproject.toml
@@ -7,12 +7,12 @@ authors = [{ "name" = "Pieter P", "email" = "pieter.p.dev@outlook.com" }]
 keywords = ["example", "addition", "subtraction", "debug"]
 classifiers = []
 urls = { "Documentation" = "https://tttapa.github.io/" }
-dependencies = ["minimal-comp==0.4.0a1.dev0"]
-version = "0.4.0a1.dev0"
+dependencies = ["minimal-comp==0.4.0"]
+version = "0.4.0"
 description = "Debug symbols for the minimal package."
 
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build_component"
 
 [tool.py-build-cmake]
diff --git a/examples/minimal-debug-component/pyproject.toml b/examples/minimal-debug-component/pyproject.toml
index 4da10b2..896b06b 100644
--- a/examples/minimal-debug-component/pyproject.toml
+++ b/examples/minimal-debug-component/pyproject.toml
@@ -26,10 +26,10 @@ dynamic = ["version", "description"]
 
 [project.optional-dependencies]
 docs = ["sphinx~=5.1", "matplotlib", "breathe", "furo"]
-debug = ["minimal-debug==0.4.0a1.dev0"]
+debug = ["minimal-debug==0.4.0"]
 
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
 
 [tool.py-build-cmake.module]
diff --git a/examples/minimal-debug-component/src-python/minimal_comp/__init__.py b/examples/minimal-debug-component/src-python/minimal_comp/__init__.py
index b2fa4db..90de70d 100644
--- a/examples/minimal-debug-component/src-python/minimal_comp/__init__.py
+++ b/examples/minimal-debug-component/src-python/minimal_comp/__init__.py
@@ -2,4 +2,4 @@
 A simple, minimal example of building a Python C module using CMake.
 """
 
-__version__ = "0.4.0a1.dev0"
+__version__ = "0.4.0"
diff --git a/examples/minimal-program/pyproject.toml b/examples/minimal-program/pyproject.toml
index 816c672..02f2f13 100644
--- a/examples/minimal-program/pyproject.toml
+++ b/examples/minimal-program/pyproject.toml
@@ -25,7 +25,7 @@ dependencies = []
 dynamic = ["version", "description"]
 
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
 
 [tool.py-build-cmake.module]
diff --git a/examples/minimal-program/src-python/minimal_program_module/__init__.py b/examples/minimal-program/src-python/minimal_program_module/__init__.py
index 0a4fb11..855aa1f 100644
--- a/examples/minimal-program/src-python/minimal_program_module/__init__.py
+++ b/examples/minimal-program/src-python/minimal_program_module/__init__.py
@@ -2,4 +2,4 @@
 A simple, minimal example of building a C++ program using CMake.
 """
 
-__version__ = "0.4.0a1.dev0"
+__version__ = "0.4.0"
diff --git a/examples/minimal/README.md b/examples/minimal/README.md
index 66e6e00..abac78e 100644
--- a/examples/minimal/README.md
+++ b/examples/minimal/README.md
@@ -120,7 +120,7 @@ for more information about specific options. More information about the
 
 ```toml
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
 ```
 
diff --git a/examples/minimal/pyproject.toml b/examples/minimal/pyproject.toml
index f152599..9d38f08 100644
--- a/examples/minimal/pyproject.toml
+++ b/examples/minimal/pyproject.toml
@@ -25,7 +25,7 @@ dependencies = []
 dynamic = ["version", "description"]
 
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
 
 [tool.py-build-cmake.module]
diff --git a/examples/minimal/src-python/minimal/__init__.py b/examples/minimal/src-python/minimal/__init__.py
index b2fa4db..90de70d 100644
--- a/examples/minimal/src-python/minimal/__init__.py
+++ b/examples/minimal/src-python/minimal/__init__.py
@@ -2,4 +2,4 @@
 A simple, minimal example of building a Python C module using CMake.
 """
 
-__version__ = "0.4.0a1.dev0"
+__version__ = "0.4.0"
diff --git a/examples/nanobind-project/CMakeLists.txt b/examples/nanobind-project/CMakeLists.txt
index d27e311..fbfa72f 100644
--- a/examples/nanobind-project/CMakeLists.txt
+++ b/examples/nanobind-project/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.26)
 project(nanobind-project VERSION 0.4.0)
-set(PY_VERSION_SUFFIX "a1.dev0")
+set(PY_VERSION_SUFFIX "")
 set(PY_FULL_VERSION ${PROJECT_VERSION}${PY_VERSION_SUFFIX})
 
 # Make sure that the Python and CMake versions match
diff --git a/examples/nanobind-project/pyproject.toml b/examples/nanobind-project/pyproject.toml
index fffea21..21d0c02 100644
--- a/examples/nanobind-project/pyproject.toml
+++ b/examples/nanobind-project/pyproject.toml
@@ -31,7 +31,7 @@ test = ["pytest>=7.2.0,<7.5"]
 
 [build-system]
 requires = [
-    "py-build-cmake~=0.4.0a1.dev0",
+    "py-build-cmake~=0.4.0",
     "nanobind~=2.2.0",
     "typing_extensions~=4.12.2; python_version < '3.11'",
 ]
diff --git a/examples/nanobind-project/python-src/nanobind_project/__init__.py b/examples/nanobind-project/python-src/nanobind_project/__init__.py
index 598eb85..14c21ce 100644
--- a/examples/nanobind-project/python-src/nanobind_project/__init__.py
+++ b/examples/nanobind-project/python-src/nanobind_project/__init__.py
@@ -1,3 +1,3 @@
 """Example project using the py-build-cmake build backend and nanobind."""
 
-__version__ = "0.4.0a1.dev0"
+__version__ = "0.4.0"
diff --git a/examples/pybind11-project/CMakeLists.txt b/examples/pybind11-project/CMakeLists.txt
index 5aea430..13d6d0e 100644
--- a/examples/pybind11-project/CMakeLists.txt
+++ b/examples/pybind11-project/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.18)
 project(pybind11-project VERSION 0.4.0)
-set(PY_VERSION_SUFFIX "a1.dev0")
+set(PY_VERSION_SUFFIX "")
 set(PY_FULL_VERSION ${PROJECT_VERSION}${PY_VERSION_SUFFIX})
 
 # Make sure that the Python and CMake versions match
diff --git a/examples/pybind11-project/pyproject.toml b/examples/pybind11-project/pyproject.toml
index 6f77be6..c9f865d 100644
--- a/examples/pybind11-project/pyproject.toml
+++ b/examples/pybind11-project/pyproject.toml
@@ -32,7 +32,7 @@ test = ["pytest>=7.2.0,<7.5"]
 
 [build-system]
 requires = [
-    "py-build-cmake~=0.4.0a1.dev0",
+    "py-build-cmake~=0.4.0",
     "pybind11~=2.13.6",
     "pybind11-stubgen~=2.5.1",
 ]
diff --git a/examples/pybind11-project/python-src/pybind11_project/__init__.py b/examples/pybind11-project/python-src/pybind11_project/__init__.py
index 482e2d7..4c082d8 100644
--- a/examples/pybind11-project/python-src/pybind11_project/__init__.py
+++ b/examples/pybind11-project/python-src/pybind11_project/__init__.py
@@ -1,3 +1,3 @@
 """Example project using the py-build-cmake build backend and pybind11."""
 
-__version__ = "0.4.0a1.dev0"
+__version__ = "0.4.0"
diff --git a/examples/swig-project/CMakeLists.txt b/examples/swig-project/CMakeLists.txt
index ccb467f..cc17d70 100644
--- a/examples/swig-project/CMakeLists.txt
+++ b/examples/swig-project/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.18)
 project(swig-project VERSION 0.4.0)
-set(PY_VERSION_SUFFIX "a1.dev0")
+set(PY_VERSION_SUFFIX "")
 set(PY_FULL_VERSION ${PROJECT_VERSION}${PY_VERSION_SUFFIX})
 set(Py_LIMITED_API 0x03070000 CACHE STRING
     "CPython stable ABI version. Should match abi3_minimum_cpython_version")
diff --git a/examples/swig-project/pyproject.toml b/examples/swig-project/pyproject.toml
index 21c5039..d8dbc42 100644
--- a/examples/swig-project/pyproject.toml
+++ b/examples/swig-project/pyproject.toml
@@ -32,7 +32,7 @@ test = ["pytest>=7.2.0,<7.5"]
 
 [build-system]
 requires = [
-    "py-build-cmake~=0.4.0a1.dev0",
+    "py-build-cmake~=0.4.0",
     "swig~=4.3.0",                # https://github.com/nightlark/swig-pypi
 ]
 build-backend = "py_build_cmake.build"
diff --git a/examples/swig-project/python-src/swig_project/__init__.py b/examples/swig-project/python-src/swig_project/__init__.py
index e952289..fa94074 100644
--- a/examples/swig-project/python-src/swig_project/__init__.py
+++ b/examples/swig-project/python-src/swig_project/__init__.py
@@ -1,3 +1,3 @@
 """Example project using the py-build-cmake build backend and SWIG."""
 
-__version__ = "0.4.0a1.dev0"
+__version__ = "0.4.0"
diff --git a/noxfile.py b/noxfile.py
index f3dfa60..aa23cc9 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -35,7 +35,7 @@
     import sysconfig as dist_sysconfig
     from sysconfig import get_platform as sysconfig_get_platform
 
-version = "0.4.0a1.dev0"
+version = "0.4.0"
 project_dir = Path(__file__).resolve().parent
 
 examples = "minimal-program", "pybind11-project", "nanobind-project"
diff --git a/src/py_build_cmake/__init__.py b/src/py_build_cmake/__init__.py
index cfcde0d..22bb440 100644
--- a/src/py_build_cmake/__init__.py
+++ b/src/py_build_cmake/__init__.py
@@ -3,4 +3,4 @@
 extensions built using CMake.
 """
 
-__version__ = "0.4.0a1.dev0"
+__version__ = "0.4.0"
diff --git a/test-packages/bare-c-module/pyproject.toml b/test-packages/bare-c-module/pyproject.toml
index 7288459..9bed95d 100644
--- a/test-packages/bare-c-module/pyproject.toml
+++ b/test-packages/bare-c-module/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "bare-c-module"
-version = "0.4.0a1.dev0"
+version = "0.4.0"
 description = "Single extension module, without any folders or __init__.py"
 readme = "README.md"
 requires-python = ">=3.7"
@@ -26,7 +26,7 @@ urls = { "Documentation" = "https://tttapa.github.io/" }
 dependencies = []
 
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
 
 [tool.py-build-cmake.module]
diff --git a/test-packages/cmake-options/pyproject.toml b/test-packages/cmake-options/pyproject.toml
index 73d05e5..6d5afe1 100644
--- a/test-packages/cmake-options/pyproject.toml
+++ b/test-packages/cmake-options/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "cmake-options"
-version = "0.4.0a1.dev0"
+version = "0.4.0"
 description = "Checks parsing and escaping of CMake options"
 readme = "README.md"
 requires-python = ">=3.7"
@@ -12,7 +12,7 @@ urls = { "Documentation" = "https://tttapa.github.io/" }
 dependencies = []
 
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
 
 [tool.py-build-cmake.sdist]
diff --git a/test-packages/cmake-preset/pyproject.toml b/test-packages/cmake-preset/pyproject.toml
index 8fc6486..802d3d2 100644
--- a/test-packages/cmake-preset/pyproject.toml
+++ b/test-packages/cmake-preset/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "cmake-preset"
-version = "0.4.0a1.dev0"
+version = "0.4.0"
 description = "Test the use of CMake presets"
 readme = "README.md"
 requires-python = ">=3.7"
@@ -8,7 +8,7 @@ license = { "file" = "LICENSE" }
 authors = [{ "name" = "Pieter P", "email" = "pieter.p.dev@outlook.com" }]
 
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
 
 [tool.py-build-cmake.module]
diff --git a/test-packages/empty-config/pyproject.toml b/test-packages/empty-config/pyproject.toml
index 7d0f28b..181a6fa 100644
--- a/test-packages/empty-config/pyproject.toml
+++ b/test-packages/empty-config/pyproject.toml
@@ -7,5 +7,5 @@ authors = [{ "name" = "Pieter P", "email" = "pieter.p.dev@outlook.com" }]
 dynamic = ["version", "description"]
 
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
diff --git a/test-packages/empty-config/src/empty_config/__init__.py b/test-packages/empty-config/src/empty_config/__init__.py
index 6168e05..95727ee 100644
--- a/test-packages/empty-config/src/empty_config/__init__.py
+++ b/test-packages/empty-config/src/empty_config/__init__.py
@@ -2,7 +2,7 @@
 Empty config
 """
 
-__version__ = "0.4.0a1.dev0"
+__version__ = "0.4.0"
 
 
 def add(a, b):
diff --git a/test-packages/find-python/pyproject.toml b/test-packages/find-python/pyproject.toml
index bb29330..d83769f 100644
--- a/test-packages/find-python/pyproject.toml
+++ b/test-packages/find-python/pyproject.toml
@@ -1,12 +1,12 @@
 [project]
 name = "find-python"
-version = "0.4.0a1.dev0"
+version = "0.4.0"
 description = "Test for CMake FindPython"
 requires-python = ">=3.7"
 license = { "text" = "-" }
 
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
 
 [tool.py-build-cmake.module]
diff --git a/test-packages/local-options/pyproject.toml b/test-packages/local-options/pyproject.toml
index 9866493..6681635 100644
--- a/test-packages/local-options/pyproject.toml
+++ b/test-packages/local-options/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "local-options"
-version = "0.4.0a1.dev0"
+version = "0.4.0"
 description = "Checks loading of local override files"
 readme = "README.md"
 requires-python = ">=3.7"
@@ -12,7 +12,7 @@ urls = { "Documentation" = "https://tttapa.github.io/" }
 dependencies = []
 
 [build-system]
-requires = ["py-build-cmake~=0.4.0a1.dev0"]
+requires = ["py-build-cmake~=0.4.0"]
 build-backend = "py_build_cmake.build"
 
 [tool.py-build-cmake.sdist]
diff --git a/test-packages/namespace-project-a/CMakeLists.txt b/test-packages/namespace-project-a/CMakeLists.txt
index 9e56a0a..0dc5b34 100644
--- a/test-packages/namespace-project-a/CMakeLists.txt
+++ b/test-packages/namespace-project-a/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.18)
 project(pybind11-project VERSION 0.4.0)
-set(PY_VERSION_SUFFIX "a1.dev0")
+set(PY_VERSION_SUFFIX "")
 set(PY_FULL_VERSION ${PROJECT_VERSION}${PY_VERSION_SUFFIX})
 
 # Make sure that the Python and CMake versions match
diff --git a/test-packages/namespace-project-a/pyproject.toml b/test-packages/namespace-project-a/pyproject.toml
index f52f2c2..d6834e1 100644
--- a/test-packages/namespace-project-a/pyproject.toml
+++ b/test-packages/namespace-project-a/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "namespace-project-a" # Name on PyPI
-version = "0.4.0a1.dev0"
+version = "0.4.0"
 readme = "README.md"
 description = "Part A of a namespace package"
 requires-python = ">=3.7"
@@ -13,7 +13,7 @@ dependencies = []
 
 [build-system]
 requires = [
-    "py-build-cmake~=0.4.0a1.dev0",
+    "py-build-cmake~=0.4.0",
     "pybind11~=2.13.6",
     "pybind11-stubgen~=2.5.1",
 ]
diff --git a/test-packages/namespace-project-b/pyproject.toml b/test-packages/namespace-project-b/pyproject.toml
index a5f8b10..b7b01ce 100644
--- a/test-packages/namespace-project-b/pyproject.toml
+++ b/test-packages/namespace-project-b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "namespace-project-b" # Name on PyPI
-version = "0.4.0a1.dev0"
+version = "0.4.0"
 readme = "README.md"
 description = "Part B of a namespace package"
 requires-python = ">=3.7"
@@ -13,7 +13,7 @@ dependencies = []
 
 [build-system]
 requires = [
-    "py-build-cmake~=0.4.0a1.dev0",
+    "py-build-cmake~=0.4.0",
 ]
 build-backend = "py_build_cmake.build"