diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d878de7..7fe8fb0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-latest, windows-latest, ubuntu-latest]
-        python-version: [3.8, 3.9, '3.10', '3.11', '3.12', pypy-3.10]
+        python-version: [3.9, '3.10', '3.11', '3.12', pypy-3.10]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
diff --git a/docs/changelog.rst b/docs/changelog.rst
index ce2393f..780c039 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -4,13 +4,14 @@ Changelog
 0.4.0 (Unreleased)
 ------------------
 
--  Some arguments must be keyword arguments:
+-  Some arguments must be keyword arguments in:
 
    :meth:`ocdsextensionregistry.profile_builder.ProfileBuilder.release_package_schema`
    :meth:`ocdsextensionregistry.profile_builder.ProfileBuilder.record_package_schema`
 
 -  Add support for Sphinx 7.
 -  Drop support for Sphinx 4.
+-  Drop support for Python 3.8.
 
 0.3.8 (2023-07-20)
 ------------------
diff --git a/docs/conf.py b/docs/conf.py
index 97b172e..170c84a 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -23,7 +23,7 @@
 author = "Open Contracting Partnership"
 
 # The short X.Y version
-version = "0.3.8"
+version = "0.4.0"
 # The full version, including alpha/beta/rc tags
 release = version
 
diff --git a/pyproject.toml b/pyproject.toml
index 7b98e3e..ce06458 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "ocdsextensionregistry"
-version = "0.3.8"
+version = "0.4.0"
 authors = [{name = "Open Contracting Partnership", email = "data@open-contracting.org"}]
 description = "Eases access to information from the extension registry of the Open Contracting Data Standard"
 readme = "README.rst"
@@ -13,7 +13,6 @@ urls = {Homepage = "https://github.com/open-contracting/extension_registry.py"}
 classifiers = [
     "License :: OSI Approved :: BSD License",
     "Operating System :: OS Independent",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",