diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index db033e9..7e11e7c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10']
+        python-version: ['3.10', '3.11']
     steps:
       - name: Checkout reposistory
         uses: actions/checkout@v3
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 214a669..580766a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,10 +8,17 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ## [Unreleased]
 
 
+## [1.5.0] - 2023-12-05
 ### Changed
 - Upgrade libraries: `numpy`, `lxml`, `scikitlearn`, `scipy`, `medcat`.
 - Added `scispacy` dependency.
 
+### Added
+- Support for Python 3.11.
+
+### Removed
+- Support for Python 3.9.
+
 
 ## [1.4.1] - 2023-09-08
 ### Changed
@@ -114,7 +121,8 @@ Downstream moderate risk update release.
 
 
 <!-- links -->
-[Unreleased]: https://github.com/Paul Landes/mednlp/compare/v1.4.1...HEAD
+[Unreleased]: https://github.com/Paul Landes/mednlp/compare/v1.5.0...HEAD
+[1.5.0]: https://github.com/Paul Landes/mednlp/compare/v1.4.1...v1.5.0
 [1.4.1]: https://github.com/Paul Landes/mednlp/compare/v1.4.0...v1.4.1
 [1.4.0]: https://github.com/Paul Landes/mednlp/compare/v1.3.2...v1.4.0
 [1.3.2]: https://github.com/Paul Landes/mednlp/compare/v1.3.1...v1.3.2
diff --git a/LICENSE.md b/LICENSE.md
index acf447a..ca5a3bf 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2021 Paul Landes
+Copyright (c) 2021 - 2023 Paul Landes
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in
diff --git a/README.md b/README.md
index c74b48c..3e4a9ad 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
 # Medical natural language parsing and utility library
 
 [![PyPI][pypi-badge]][pypi-link]
-[![Python 3.9][python39-badge]][python39-link]
 [![Python 3.10][python310-badge]][python310-link]
+[![Python 3.11][python311-badge]][python311-link]
 [![Build Status][build-badge]][build-link]
 
 A natural language medical domain parsing library.  This library:
@@ -85,18 +85,29 @@ This API utilizes the following frameworks:
 ## Citation
 
 If you use this project in your research please use the following BibTeX entry:
+
 ```bibtex
-@article{Landes_DiEugenio_Caragea_2021,
-  title={DeepZensols: Deep Natural Language Processing Framework},
-  url={http://arxiv.org/abs/2109.03383},
-  note={arXiv: 2109.03383},
-  journal={arXiv:2109.03383 [cs]},
-  author={Landes, Paul and Di Eugenio, Barbara and Caragea, Cornelia},
-  year={2021},
-  month={Sep}
+@inproceedings{landes-etal-2023-deepzensols,
+    title = "{D}eep{Z}ensols: A Deep Learning Natural Language Processing Framework for Experimentation and Reproducibility",
+    author = "Landes, Paul  and
+      Di Eugenio, Barbara  and
+      Caragea, Cornelia",
+    editor = "Tan, Liling  and
+      Milajevs, Dmitrijs  and
+      Chauhan, Geeticka  and
+      Gwinnup, Jeremy  and
+      Rippeth, Elijah",
+    booktitle = "Proceedings of the 3rd Workshop for Natural Language Processing Open Source Software (NLP-OSS 2023)",
+    month = dec,
+    year = "2023",
+    address = "Singapore, Singapore",
+    publisher = "Empirical Methods in Natural Language Processing",
+    url = "https://aclanthology.org/2023.nlposs-1.16",
+    pages = "141--146"
 }
 ```
 
+
 ## Community
 
 Please star the project and let me know how and where you use this API.
@@ -119,10 +130,10 @@ Copyright (c) 2021 - 2023 Paul Landes
 [pypi]: https://pypi.org/project/zensols.mednlp/
 [pypi-link]: https://pypi.python.org/pypi/zensols.mednlp
 [pypi-badge]: https://img.shields.io/pypi/v/zensols.mednlp.svg
-[python39-badge]: https://img.shields.io/badge/python-3.9-blue.svg
-[python39-link]: https://www.python.org/downloads/release/python-390
 [python310-badge]: https://img.shields.io/badge/python-3.10-blue.svg
 [python310-link]: https://www.python.org/downloads/release/python-3100
+[python311-badge]: https://img.shields.io/badge/python-3.11-blue.svg
+[python311-link]: https://www.python.org/downloads/release/python-3110
 [build-badge]: https://github.com/plandes/mednlp/workflows/CI/badge.svg
 [build-link]: https://github.com/plandes/mednlp/actions
 
diff --git a/src/python/requirements.txt b/src/python/requirements.txt
index d34045a..d9a6038 100644
--- a/src/python/requirements.txt
+++ b/src/python/requirements.txt
@@ -1,11 +1,11 @@
 # base
-numpy>=1.25.2
 lxml~=4.9.3
+numpy~=1.25.2
 scikit-learn~=1.3.2
 
 # medcat
-pandas~=2.1.3
 blis~=0.7.11
+pandas~=2.1.3
 scipy~=1.9.3
 scispacy~=0.5.3
 medcat~=1.9.3
@@ -14,5 +14,5 @@ medcat~=1.9.3
 ctakes-parser~=0.1.0
 
 # zensols
-zensols.install~=1.0.0
-zensols.nlp~=1.8.0
+zensols.install~=1.1.0
+zensols.nlp~=1.9.0
diff --git a/zenbuild b/zenbuild
index 33fb638..b94e8df 160000
--- a/zenbuild
+++ b/zenbuild
@@ -1 +1 @@
-Subproject commit 33fb6386fdbc5907b87de3cd4cc3fb6d4768ceac
+Subproject commit b94e8df21d092fa23eeea59babf84b9c9ed69fe0