diff --git a/.travis.yml b/.travis.yml
index 796b1a93c..8ed2c44af 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,7 +18,7 @@ env:
   - SPHINX_DIR=doc/
   - HTML_DIR=doc/build/html
   - PYTHON_VERSION=3.6
-  - CONDA_DEPENDENCIES="jupyter_contrib_nbextensions nglview sphinx ipywidgets MDAnalysis MDAnalysisTests plotly"
+  - CONDA_DEPENDENCIES="jupyter_contrib_nbextensions nglview sphinx ipywidgets matplotlib==3.2.2 MDAnalysis MDAnalysisTests plotly"
   - CONDA_CHANNELS='defaults conda-forge plotly'
   - PIP_DEPENDENCIES="sphinx_rtd_theme sphinx-sitemap nbsphinx ipython tabulate sphinxcontrib-bibtex pybtex msmb_theme==1.2.0"
   - CYTHON_TRACE_NOGIL=1
diff --git a/environment.yml b/environment.yml
index 285dc290d..7eead18ce 100644
--- a/environment.yml
+++ b/environment.yml
@@ -7,6 +7,7 @@ dependencies:
   - ipywidgets
   - ipython
   - jupyter_contrib_nbextensions
+  - matplotlib==3.2.2
   - mdanalysis
   - MDAnalysisTests
   - nbsphinx
diff --git a/requirements.txt b/requirements.txt
index a27cc26ff..674fd3f0b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 ipython==7.14.0
 ipywidgets==7.5.1
 jupyter-contrib-nbextensions
+matplotlib==3.2.2
 MDAnalysis==1.0.0
 MDAnalysisTests==1.0.0
 msmb_theme==1.2.0