diff --git a/CHANGES b/CHANGES
index a6d5f41..5ca2959 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,19 @@
 Changelog
 =========
 
+Version 1.4.0
+-------------
+
+Released on 2026-01-29.
+
+*   Dropped support for Python 3.9 and PyPy 3.10.
+
+*   Added support for Python 3.14 and PyPy 3.11.
+
+*   Switched the build system to ``hatchling``.
+
+*   CI fixes and improvements.
+
 Version 1.3.0
 -------------
 
diff --git a/cssselect/__init__.py b/cssselect/__init__.py
index 67acaaa..59d62df 100644
--- a/cssselect/__init__.py
+++ b/cssselect/__init__.py
@@ -32,5 +32,5 @@
     "parse",
 )
 
-VERSION = "1.3.0"
+VERSION = "1.4.0"
 __version__ = VERSION
diff --git a/docs/conf.py b/docs/conf.py
index 5713d17..da3f023 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -32,7 +32,7 @@
 templates_path = ["_templates"]
 
 # The suffix of source filenames.
-source_suffix = ".rst"
+source_suffix = {".rst": "restructuredtext"}
 
 # The encoding of source files.
 # source_encoding = 'utf-8-sig'
diff --git a/pyproject.toml b/pyproject.toml
index e22a153..c7c54a0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,13 +48,19 @@ exclude = [
 packages = ["cssselect"]
 
 [tool.bumpversion]
-current_version = "1.3.0"
+current_version = "1.4.0"
 commit = true
 tag = true
 
 [[tool.bumpversion.files]]
 filename = "cssselect/__init__.py"
 
+[[tool.bumpversion.files]]
+filename = "CHANGES"
+search = "^Unreleased\\.$"
+replace = "Released on {now:%Y-%m-%d}."
+regex = true
+
 [tool.coverage.run]
 branch = true
 source = ["cssselect"]