diff --git a/doc/manual/conf.py b/doc/manual/conf.py
index 28ed21ffd..c49541a5e 100644
--- a/doc/manual/conf.py
+++ b/doc/manual/conf.py
@@ -37,6 +37,7 @@
 extensions = [
     'sphinxcontrib.bibtex'
 ]
+bibtex_bibfiles = ['m/refs.bib']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
diff --git a/doc/manual/requirements.txt b/doc/manual/requirements.txt
index 476f2e7a7..26df9618c 100644
--- a/doc/manual/requirements.txt
+++ b/doc/manual/requirements.txt
@@ -1,31 +1,36 @@
 alabaster==0.7.12
-Babel==2.9.1
-certifi==2020.12.5
+Babel==2.10.1
+beautifulsoup4==4.11.1
+certifi==2022.5.18.1
 chardet==4.0.0
-docutils==0.16
-idna==2.10
-imagesize==1.2.0
-Jinja2==2.11.3
+charset-normalizer==2.0.12
+docutils==0.17.1
+idna==3.3
+imagesize==1.3.0
+importlib-metadata==4.11.4
+Jinja2==3.1.2
 latexcodec==2.0.1
-MarkupSafe==1.1.1
+MarkupSafe==2.1.1
 oset==0.1.3
-packaging==20.8
-pybtex==0.23.0
-pybtex-docutils==0.2.2
-pydata-sphinx-theme==0.4.1
-Pygments==2.7.4
-pyparsing==2.4.7
-pytz==2020.4
-PyYAML==5.4
-requests==2.25.1
-six==1.15.0
-snowballstemmer==2.0.0
-Sphinx==3.4.0
+packaging==21.3
+pybtex==0.24.0
+pybtex-docutils==1.0.2
+pydata-sphinx-theme==0.8.1
+Pygments==2.12.0
+pyparsing==3.0.9
+pytz==2022.1
+PyYAML==6.0
+requests==2.27.1
+six==1.16.0
+snowballstemmer==2.2.0
+soupsieve==2.3.2.post1
+Sphinx==4.5.0
 sphinxcontrib-applehelp==1.0.2
-sphinxcontrib-bibtex==1.0.0
+sphinxcontrib-bibtex==2.4.2
 sphinxcontrib-devhelp==1.0.2
-sphinxcontrib-htmlhelp==1.0.3
+sphinxcontrib-htmlhelp==2.0.0
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
-sphinxcontrib-serializinghtml==1.1.4
-urllib3==1.26.5
+sphinxcontrib-serializinghtml==1.1.5
+urllib3==1.26.9
+zipp==3.8.0