diff --git a/user_config/requirements.docs.in b/user_config/requirements.docs.in
index a7a8e1a8541730d508766924f43f2e57e052cba7..4687ddf4835bd5315736bfe2397e1e73845f0eb5 100644
--- a/user_config/requirements.docs.in
+++ b/user_config/requirements.docs.in
@@ -46,14 +46,6 @@ mkdocs-exclude
 # https://pypi.org/project/pykwalify/
 pykwalify
 
-# Markdown extension to wrap images in a lightbox.
-# https://github.com/g-provost/lightgallery-markdown
-git+https://github.com/g-provost/lightgallery-markdown
-
-# A Mermaid graphs plugin for mkdocs
-# https://github.com/fralau/mkdocs-mermaid2-plugin#declaring-the-superfences-extension
-mkdocs-mermaid2-plugin
-
 # A MkDocs plugin for dynamic page redirects to prevent broken links.
 # https://pypi.org/project/mkdocs-redirects/
 mkdocs-redirects
diff --git a/user_config/requirements.docs.txt b/user_config/requirements.docs.txt
index 92670c6c350c5e835feea21fef36257917657643..d8cf3fbde6da792600a83f3ed03627cfb0790c50 100644
--- a/user_config/requirements.docs.txt
+++ b/user_config/requirements.docs.txt
@@ -8,39 +8,25 @@ astunparse==1.6.3
     # via pytkdocs
 babel==2.9.1
     # via mkdocs-git-revision-date-localized-plugin
-beautifulsoup4==4.9.3
-    # via mkdocs-mermaid2-plugin
-certifi==2020.12.5
-    # via requests
-chardet==4.0.0
-    # via requests
-click==7.1.2
+click==8.0.0
     # via
     #   mkdocs
     #   nltk
 docopt==0.6.2
     # via pykwalify
-editorconfig==0.12.3
-    # via jsbeautifier
 future==0.18.2
     # via lunr
 gitdb==4.0.7
     # via gitpython
-gitpython==3.1.14
+gitpython==3.1.17
     # via mkdocs-git-revision-date-localized-plugin
-idna==2.10
-    # via requests
-jinja2==2.11.3
+jinja2==3.0.0
     # via
     #   mkdocs
     #   mkdocs-macros-plugin
     #   mkdocstrings
 joblib==1.0.1
     # via nltk
-jsbeautifier==1.13.13
-    # via mkdocs-mermaid2-plugin
-git+https://github.com/g-provost/lightgallery-markdown
-    # via -r requirements.docs.in
 livereload==2.6.3
     # via mkdocs
 lunr[languages]==0.5.8
@@ -49,18 +35,17 @@ markdown-include==0.6.0
     # via -r requirements.docs.in
 markdown==3.3.4
     # via
-    #   lightgallery
     #   markdown-include
     #   mkdocs
     #   mkdocs-autorefs
     #   mkdocs-material
     #   mkdocstrings
     #   pymdown-extensions
-markupsafe==1.1.1
+markupsafe==2.0.0
     # via
     #   jinja2
     #   mkdocstrings
-mkdocs-autorefs==0.1.1
+mkdocs-autorefs==0.2.1
     # via mkdocstrings
 mkdocs-exclude==1.0.2
     # via -r requirements.docs.in
@@ -75,9 +60,6 @@ mkdocs-material==7.1.4
     #   -r requirements.docs.in
     #   mkdocs-macros-plugin
     #   mkdocs-material-extensions
-    #   mkdocs-mermaid2-plugin
-mkdocs-mermaid2-plugin==0.5.1
-    # via -r requirements.docs.in
 mkdocs-monorepo-plugin==0.4.14
     # via -r requirements.docs.in
 mkdocs-redirects==1.0.3
@@ -92,12 +74,11 @@ mkdocs==1.1.2
     #   mkdocs-git-revision-date-localized-plugin
     #   mkdocs-macros-plugin
     #   mkdocs-material
-    #   mkdocs-mermaid2-plugin
     #   mkdocs-monorepo-plugin
     #   mkdocs-redirects
     #   mkdocs-section-index
     #   mkdocstrings
-mkdocstrings==0.15.0
+mkdocstrings==0.15.1
     # via -r requirements.docs.in
 nltk==3.6.2
     # via lunr
@@ -105,10 +86,9 @@ pygments==2.9.0
     # via mkdocs-material
 pykwalify==1.8.0
     # via -r requirements.docs.in
-pymdown-extensions==8.1.1
+pymdown-extensions==8.2
     # via
     #   mkdocs-material
-    #   mkdocs-mermaid2-plugin
     #   mkdocstrings
 python-dateutil==2.8.1
     # via
@@ -122,11 +102,8 @@ pyyaml==5.4.1
     # via
     #   mkdocs
     #   mkdocs-macros-plugin
-    #   mkdocs-mermaid2-plugin
 regex==2021.4.4
     # via nltk
-requests==2.25.1
-    # via mkdocs-mermaid2-plugin
 ruamel.yaml.clib==0.2.2
     # via ruamel.yaml
 ruamel.yaml==0.17.4
@@ -134,15 +111,12 @@ ruamel.yaml==0.17.4
 six==1.16.0
     # via
     #   astunparse
-    #   jsbeautifier
     #   livereload
     #   lunr
     #   mkdocs-redirects
     #   python-dateutil
 smmap==4.0.0
     # via gitdb
-soupsieve==2.2.1
-    # via beautifulsoup4
 termcolor==1.1.0
     # via mkdocs-macros-plugin
 tornado==6.1
@@ -151,10 +125,5 @@ tornado==6.1
     #   mkdocs
 tqdm==4.60.0
     # via nltk
-urllib3==1.26.4
-    # via requests
 wheel==0.36.2
     # via astunparse
-
-# The following packages are considered to be unsafe in a requirements file:
-# setuptools