diff --git a/docs/about.rst b/docs/about.rst
index 98af539..c38fcd9 100644
--- a/docs/about.rst
+++ b/docs/about.rst
@@ -35,6 +35,6 @@ If you publish about work for which PENSA was useful, please cite our preprint:
 
 The reference for the software implementation itself is the following:
 
-    Martin Vögele, Neil Thomson, Sang Truong, Jasper McAvity: *PENSA*. Zenodo, 2023. http://doi.org/10.5281/zenodo.4362136
+    Martin Vögele, Neil Thomson, Sang Truong, Jasper McAvity: *PENSA*. Zenodo, 2024. http://doi.org/10.5281/zenodo.4362136
 
 To get the citation and DOI for a particular version, see `Zenodo <https://zenodo.org/record/4362136>`_.
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 74de346..523dada 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -8,12 +8,11 @@ sphinxcontrib-jsmath
 sphinxcontrib-qthelp
 sphinxcontrib-serializinghtml
 numpy==1.22
-scipy>=1.2
+scipy==1.9
 pandas==1.4
-matplotlib
+matplotlib==3.5
 deeptime
 MDAnalysis==2.2
-scikit-learn
 cython
 biotite
 pensa==0.3.0
diff --git a/setup.py b/setup.py
index 936eb90..eb775ec 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name='pensa',
-    version='0.3.0',
+    version='0.4.0',
     description='exploratory analysis and comparison of biomolecular conformational ensembles.',
     url='http://github.com/drorlab/pensa',
     author='Martin Voegele, Neil Thomson, Sang Truong, Jasper McAvity',