diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 53c3b91..3564571 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,7 +11,7 @@ jobs:
       - name: Build
         shell: bash -l {0}
         run: |
-          conda install -y openturns numpy pytest numpydoc sphinx sphinx-gallery sphinx_rtd_theme pandoc flake8
+          conda install -y openturns numpy pytest numpydoc sphinx sphinx-gallery sphinx_rtd_theme pandoc flake8 "matplotlib<3.7"
           flake8 --max-line-length=120
           python setup.py install
           pytest
diff --git a/doc/conf.py b/doc/conf.py
index b9731d2..30b2b25 100755
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -91,7 +91,7 @@
 
 # General information about the project.
 project = u"ottemplate"
-copyright = u"2005-2022 Airbus-EDF-IMACS-ONERA-Phimeca"
+copyright = u"2005-2023 Airbus-EDF-IMACS-ONERA-Phimeca"
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.