diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index db9bfa28c5688356eb3891571286919b3705148b..7a8fcc4e8109c933d04b672129aeb0b826c6eced 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -37,8 +37,8 @@ test:python38:
 pages:
   stage: deploy
   script:
-    - pyenv install 3.6.9
-    - pyenv shell 3.6.9
+    - pyenv install 3.8.0
+    - pyenv shell 3.8.0
     - pip install --upgrade pip
     - pip install -r requirements.txt
     - cd sphinx-doc/
diff --git a/sphinx-doc/requirements_sphinx.txt b/sphinx-doc/requirements_sphinx.txt
index 2560caf2ecdaf9c1797722402c9229f83983d1c4..511d1671395df732730a0d0807e394fea54e0569 100644
--- a/sphinx-doc/requirements_sphinx.txt
+++ b/sphinx-doc/requirements_sphinx.txt
@@ -1,68 +1,5 @@
-alabaster==0.7.12
-appdirs==1.4.4
-astor==0.8.1
-Babel==2.9.0
-attrs==20.3.0
-black==20.8b1
-certifi==2020.11.8
-chardet==3.0.4
-Click==7.1.2
-commonmark==0.9.1
-cycler==0.10.0
-decorator==4.4.2
-dios==0.6.0
-docutils==0.16
-dtw==1.4.0
-idna==2.10
-imagesize==1.2.0
-importlib-metadata==3.1.0
-Jinja2==2.11.2
-joblib==0.17.0
-kiwisolver==1.3.1
-llvmlite==0.34.0
-Markdown==3.3.3
-MarkupSafe==1.1.1
-matplotlib==3.3.3
-mlxtend==0.18.0
-more-itertools==8.6.0
-numba==0.51.2
-numpy==1.19.4
-outlier==0.2
-outlier-utils==0.0.3
-packaging==20.7
-pandas==1.1.4
-pathspec==0.8.1
-pluggy==0.13.1
-py==1.8.1
-pyarrow==1.0.1
-Pygments==2.7.2
-pyparsing==2.4.6
-pytest==6.1.2
-pytest-lazy-fixture==0.6.3
-python-dateutil==2.8.1
-python-intervals==1.10.0
-pytz==2020.4
-PyWavelets==1.1.1
-recommonmark==0.6.0
-requests==2.25.0
-regex==2020.11.13
-scikit-learn==0.22.1
-scipy==1.5.4
-six==1.14.0
-snowballstemmer==2.0.0
-Sphinx==3.3.1
-sphinx-automodapi==0.13
-sphinx-markdown-tables==0.0.15
-sphinxcontrib-applehelp==1.0.2
-sphinxcontrib-devhelp==1.0.2
-sphinxcontrib-fulltoc==1.2.0
-sphinxcontrib-htmlhelp==1.0.3
-sphinxcontrib-jsmath==1.0.1
-sphinxcontrib-qthelp==1.0.3
-sphinxcontrib-serializinghtml==1.1.4
-toml==0.10.2
-typed-ast==1.4.1
-urllib3==1.26.2
-utils==1.0.1
-wcwidth==0.1.8
-zipp==3.4.0
+recommonmark
+sphinx
+sphinx-automodapi
+sphinxcontrib-fulltoc
+sphinx-markdown-tables