diff --git a/CITATION.cff b/CITATION.cff
index 0833f3f..e5a02eb 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -8,5 +8,5 @@ authors:
   given-names: Bram
   orcid: https://orcid.org/0000-0002-3755-5929
 title: pagexml-tools
-version: 0.4.0
-date-released: 2023-09-27
+version: 0.4.1
+date-released: 2023-11-16
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 88cf4de..233997d 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,34 +1,40 @@
-brotli==1.0.9 ; python_version >= "3.8" and python_version < "3.12" and platform_python_implementation == "CPython"
-brotlicffi==1.0.9.2 ; python_version >= "3.8" and python_version < "3.12" and platform_python_implementation == "PyPy"
-cffi==1.15.1 ; python_version >= "3.8" and python_version < "3.12" and platform_python_implementation == "PyPy"
-colorama==0.4.6 ; python_version >= "3.8" and python_version < "3.12" and platform_system == "Windows"
-contourpy==1.0.7 ; python_version >= "3.8" and python_version < "3.12"
-cycler==0.11.0 ; python_version >= "3.8" and python_version < "3.12"
-fonttools==4.39.3 ; python_version >= "3.8" and python_version < "3.12"
-fuzzy-search==1.6.0 ; python_version >= "3.8" and python_version < "3.12"
-importlib-resources==5.12.0 ; python_version >= "3.8" and python_version < "3.10"
-inflate64==0.3.1 ; python_version >= "3.8" and python_version < "3.12"
-kiwisolver==1.4.4 ; python_version >= "3.8" and python_version < "3.12"
-matplotlib==3.7.1 ; python_version >= "3.8" and python_version < "3.12"
-multivolumefile==0.2.3 ; python_version >= "3.8" and python_version < "3.12"
-numpy==1.24.2 ; python_version >= "3.8" and python_version < "3.12"
-packaging==23.0 ; python_version >= "3.8" and python_version < "3.12"
-pandas==1.5.3 ; python_version >= "3.8" and python_version < "3.12"
-pillow==9.5.0 ; python_version >= "3.8" and python_version < "3.12"
-psutil==5.9.4 ; python_version >= "3.8" and python_version < "3.12" and sys_platform != "cygwin"
-py7zr==0.20.4 ; python_version >= "3.8" and python_version < "3.12"
-pybcj==1.0.1 ; python_version >= "3.8" and python_version < "3.12"
-pycparser==2.21 ; python_version >= "3.8" and python_version < "3.12" and platform_python_implementation == "PyPy"
-pycryptodomex==3.17 ; python_version >= "3.8" and python_version < "3.12"
-pyparsing==3.0.9 ; python_version >= "3.8" and python_version < "3.12"
-pyppmd==1.0.0 ; python_version >= "3.8" and python_version < "3.12"
-python-dateutil==2.8.2 ; python_version >= "3.8" and python_version < "3.12"
-pytz==2023.3 ; python_version >= "3.8" and python_version < "3.12"
-pyzstd==0.15.6 ; python_version >= "3.8" and python_version < "3.12"
-scipy==1.10.1 ; python_version >= "3.8" and python_version < "3.12"
-seaborn==0.12.2 ; python_version >= "3.8" and python_version < "3.12"
-six==1.16.0 ; python_version >= "3.8" and python_version < "3.12"
-texttable==1.6.7 ; python_version >= "3.8" and python_version < "3.12"
-tqdm==4.65.0 ; python_version >= "3.8" and python_version < "3.12"
-xmltodict==0.12.0 ; python_version >= "3.8" and python_version < "3.12"
-zipp==3.15.0 ; python_version >= "3.8" and python_version < "3.10"
+brotli==1.1.0 ; python_version >= "3.8" and python_version < "4.0" and platform_python_implementation == "CPython"
+brotlicffi==1.1.0.0 ; python_version >= "3.8" and python_version < "4.0" and platform_python_implementation == "PyPy"
+cffi==1.16.0 ; python_version >= "3.8" and python_version < "4.0" and platform_python_implementation == "PyPy"
+colorama==0.4.6 ; python_version >= "3.8" and python_version < "4.0" and platform_system == "Windows"
+contourpy==1.1.1 ; python_version >= "3.8" and python_version < "4.0"
+cycler==0.12.1 ; python_version >= "3.8" and python_version < "4.0"
+fonttools==4.44.3 ; python_version >= "3.8" and python_version < "4.0"
+fuzzy-search==2.0.1a0 ; python_version >= "3.8" and python_version < "4.0"
+importlib-resources==6.1.1 ; python_version >= "3.8" and python_version < "3.10"
+inflate64==1.0.0 ; python_version >= "3.8" and python_version < "4.0"
+kiwisolver==1.4.5 ; python_version >= "3.8" and python_version < "4.0"
+matplotlib==3.7.3 ; python_version >= "3.8" and python_version < "4.0"
+multivolumefile==0.2.3 ; python_version >= "3.8" and python_version < "4.0"
+numpy==1.24.4 ; python_version >= "3.8" and python_version < "4.0"
+packaging==23.2 ; python_version >= "3.8" and python_version < "4.0"
+pandas==2.0.3 ; python_version >= "3.8" and python_version < "4.0"
+pillow==10.1.0 ; python_version >= "3.8" and python_version < "4.0"
+psutil==5.9.6 ; python_version >= "3.8" and python_version < "4.0" and sys_platform != "cygwin"
+py7zr==0.20.8 ; python_version >= "3.8" and python_version < "4.0"
+pybcj==1.0.2 ; python_version >= "3.8" and python_version < "4.0"
+pycparser==2.21 ; python_version >= "3.8" and python_version < "4.0" and platform_python_implementation == "PyPy"
+pycryptodomex==3.19.0 ; python_version >= "3.8" and python_version < "4.0"
+pyparsing==3.1.1 ; python_version >= "3.8" and python_version < "4.0"
+pyppmd==1.1.0 ; python_version >= "3.8" and python_version < "4.0"
+python-dateutil==2.8.2 ; python_version >= "3.8" and python_version < "4.0"
+pytz==2023.3.post1 ; python_version >= "3.8" and python_version < "4.0"
+pyyaml==6.0.1 ; python_version >= "3.8" and python_version < "4.0"
+pyzstd==0.15.9 ; python_version >= "3.8" and python_version < "4.0"
+scipy==1.9.3 ; python_version >= "3.8" and python_version < "4.0"
+seaborn==0.13.0 ; python_version >= "3.8" and python_version < "4.0"
+setuptools-scm==8.0.4 ; python_version >= "3.8" and python_version < "4.0"
+setuptools==68.2.2 ; python_version >= "3.8" and python_version < "4.0"
+six==1.16.0 ; python_version >= "3.8" and python_version < "4.0"
+texttable==1.7.0 ; python_version >= "3.8" and python_version < "4.0"
+tomli==2.0.1 ; python_version >= "3.8" and python_version < "3.11"
+tqdm==4.66.1 ; python_version >= "3.8" and python_version < "4.0"
+typing-extensions==4.8.0 ; python_version >= "3.8" and python_version < "4.0"
+tzdata==2023.3 ; python_version >= "3.8" and python_version < "4.0"
+xmltodict==0.13.0 ; python_version >= "3.8" and python_version < "4.0"
+zipp==3.17.0 ; python_version >= "3.8" and python_version < "3.10"
diff --git a/pagexml/__init__.py b/pagexml/__init__.py
index abeeedb..f0ede3d 100644
--- a/pagexml/__init__.py
+++ b/pagexml/__init__.py
@@ -1 +1 @@
-__version__ = '0.4.0'
+__version__ = '0.4.1'