diff --git a/.bumpversion.cfg b/.bumpversion.cfg
deleted file mode 100644
index f81c71d..0000000
--- a/.bumpversion.cfg
+++ /dev/null
@@ -1,9 +0,0 @@
-[bumpversion]
-current_version = 2.4.0
-commit = True
-tag = True
-tag_name = v{new_version}
-
-[bumpversion:file:setup.py]
-
-[bumpversion:file:scrapy_zyte_smartproxy/__init__.py]
diff --git a/docs/news.rst b/docs/news.rst
index 40b8125..0ddb466 100644
--- a/docs/news.rst
+++ b/docs/news.rst
@@ -3,6 +3,12 @@
 Changes
 =======
 
+v2.4.1 (unreleased)
+-------------------
+
+Stop expecting a ``Zyte-Error`` header in responses from `Zyte API`_ `proxy
+mode`_, it is named ``Zyte-Error-Type``.
+
 v2.4.0 (2024-12-30)
 -------------------
 
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..c1a1112
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,17 @@
+[tool.bumpversion]
+current_version = "2.4.0"
+commit = true
+tag = true
+tag_name = "v{new_version}"
+
+[[tool.bumpversion.files]]
+filename = "docs/news.rst"
+search = "\\(unreleased\\)$"
+replace = "({now:%Y-%m-%d})"
+regex = true
+
+[[tool.bumpversion.files]]
+filename = "scrapy_zyte_smartproxy/__init__.py"
+
+[[tool.bumpversion.files]]
+filename = "setup.py"