diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 52f44d28d5..6af0cad823 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -23,3 +23,5 @@ python:
   - requirements: doc/requirements.txt
   - method: pip
     path: .
+    extra_requirements:
+      - docs
diff --git a/doc/requirements.in b/doc/requirements.in
new file mode 100644
index 0000000000..f10fa243b1
--- /dev/null
+++ b/doc/requirements.in
@@ -0,0 +1,6 @@
+# Input file for pip-compile 
+# Only specify the packages necessary for [docs]
+
+sphinx==6.2.1
+sphinx-rtd-theme==1.2.2
+sphinxcontrib-bibtex==2.5.0
diff --git a/doc/requirements.txt b/doc/requirements.txt
index f846292857..4daf081949 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -2,554 +2,64 @@
 # This file is autogenerated by pip-compile with Python 3.10
 # by the following command:
 #
-#    pip-compile --allow-unsafe --extra=docs --output-file=doc/requirements.txt pyproject.toml
+#    pip-compile --allow-unsafe --output-file=requirements.txt requirements.in
 #
 alabaster==0.7.13
     # via sphinx
-anyio==3.7.1
-    # via
-    #   httpcore
-    #   jupyter-server
-argon2-cffi==21.3.0
-    # via jupyter-server
-argon2-cffi-bindings==21.2.0
-    # via argon2-cffi
-argparse==1.4.0
-    # via pretenders
-arrow==1.2.3
-    # via isoduration
-asttokens==2.2.1
-    # via stack-data
-async-lru==2.0.4
-    # via jupyterlab
-attrs==23.1.0
-    # via
-    #   jsonschema
-    #   referencing
 babel==2.12.1
-    # via
-    #   jupyterlab-server
-    #   sphinx
-backcall==0.2.0
-    # via ipython
-beautifulsoup4==4.12.2
-    # via nbconvert
-bleach==6.0.0
-    # via nbconvert
-bottle==0.12.25
-    # via pretenders
+    # via sphinx
 certifi==2023.7.22
-    # via
-    #   httpcore
-    #   httpx
-    #   requests
-cffi==1.15.1
-    # via argon2-cffi-bindings
+    # via requests
 charset-normalizer==3.2.0
     # via requests
-click==8.1.6
-    # via
-    #   dask
-    #   ixmp
-    #   message-ix
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
-cloudpickle==2.2.1
-    # via dask
-colorama==0.4.6
-    # via
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
-comm==0.1.4
-    # via
-    #   ipykernel
-    #   ipywidgets
-contourpy==1.1.0
-    # via matplotlib
-coverage[toml]==7.2.7
-    # via pytest-cov
-cycler==0.11.0
-    # via matplotlib
-dask[array]==2023.8.0
-    # via genno
-debugpy==1.6.7
-    # via ipykernel
-decorator==5.1.1
-    # via ipython
-defusedxml==0.7.1
-    # via nbconvert
 docutils==0.18.1
     # via
     #   pybtex-docutils
     #   sphinx
     #   sphinx-rtd-theme
     #   sphinxcontrib-bibtex
-et-xmlfile==1.1.0
-    # via openpyxl
-exceptiongroup==1.1.2
-    # via
-    #   anyio
-    #   pytest
-execnet==2.0.2
-    # via pytest-xdist
-executing==1.2.0
-    # via stack-data
-fastjsonschema==2.18.0
-    # via nbformat
-fonttools==4.42.0
-    # via matplotlib
-fqdn==1.5.1
-    # via jsonschema
-fsspec==2023.6.0
-    # via dask
-genno[compat,graphviz,plotnine,pyam]==1.17.2
-    # via
-    #   ixmp
-    #   message-ix
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
-gitdb==4.0.10
-    # via gitpython
-gitpython==3.1.32
-    # via ixmp
-graphviz==0.20.1
-    # via genno
-h11==0.14.0
-    # via httpcore
-h2==4.1.0
-    # via httpx
-hpack==4.0.0
-    # via h2
-httpcore==0.17.3
-    # via httpx
-httpx[http2]==0.24.1
-    # via pyam-iamc
-hyperframe==6.0.1
-    # via h2
-iam-units==2022.10.27
-    # via
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
-    #   pyam-iamc
 idna==3.4
-    # via
-    #   anyio
-    #   httpx
-    #   jsonschema
-    #   requests
+    # via requests
 imagesize==1.4.1
     # via sphinx
-importlib-metadata==6.8.0
-    # via
-    #   dask
-    #   pyam-iamc
-iniconfig==2.0.0
-    # via pytest
-ipykernel==6.25.0
-    # via
-    #   jupyter
-    #   jupyter-console
-    #   jupyterlab
-    #   qtconsole
-ipython==8.14.0
-    # via
-    #   ipykernel
-    #   ipywidgets
-    #   jupyter-console
-ipython-genutils==0.2.0
-    # via qtconsole
-ipywidgets==8.1.0
-    # via jupyter
-isoduration==20.11.0
-    # via jsonschema
-ixmp[docs,report,tests,tutorial]==3.7.0
-    # via
-    #   message-ix
-    #   message-ix-models
-jedi==0.19.0
-    # via ipython
 jinja2==3.1.2
-    # via
-    #   jupyter-server
-    #   jupyterlab
-    #   jupyterlab-server
-    #   nbconvert
-    #   numpydoc
-    #   sphinx
-jpype1==1.4.1
-    # via ixmp
-json5==0.9.14
-    # via jupyterlab-server
-jsonpointer==2.4
-    # via jsonschema
-jsonschema[format-nongpl]==4.19.0
-    # via
-    #   jupyter-events
-    #   jupyterlab-server
-    #   nbformat
-jsonschema-specifications==2023.7.1
-    # via jsonschema
-jupyter==1.0.0
-    # via ixmp
-jupyter-client==8.3.0
-    # via
-    #   ipykernel
-    #   jupyter-console
-    #   jupyter-server
-    #   nbclient
-    #   qtconsole
-jupyter-console==6.6.3
-    # via jupyter
-jupyter-core==5.3.1
-    # via
-    #   ipykernel
-    #   jupyter-client
-    #   jupyter-console
-    #   jupyter-server
-    #   jupyterlab
-    #   nbclient
-    #   nbconvert
-    #   nbformat
-    #   qtconsole
-jupyter-events==0.7.0
-    # via jupyter-server
-jupyter-lsp==2.2.0
-    # via jupyterlab
-jupyter-server==2.7.0
-    # via
-    #   jupyter-lsp
-    #   jupyterlab
-    #   jupyterlab-server
-    #   notebook
-    #   notebook-shim
-jupyter-server-terminals==0.4.4
-    # via jupyter-server
-jupyterlab==4.0.4
-    # via notebook
-jupyterlab-pygments==0.2.2
-    # via nbconvert
-jupyterlab-server==2.24.0
-    # via
-    #   jupyterlab
-    #   notebook
-jupyterlab-widgets==3.0.8
-    # via ipywidgets
-kiwisolver==1.4.4
-    # via matplotlib
+    # via sphinx
 latexcodec==2.0.1
     # via pybtex
-locket==1.0.0
-    # via partd
-lxml==4.9.3
-    # via sdmx1
 markupsafe==2.1.3
-    # via
-    #   jinja2
-    #   nbconvert
-matplotlib==3.7.0
-    # via
-    #   mizani
-    #   plotnine
-    #   pyam-iamc
-    #   seaborn
-matplotlib-inline==0.1.6
-    # via
-    #   ipykernel
-    #   ipython
-memory-profiler==0.61.0
-    # via ixmp
-message-ix==3.7.0
-    # via
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
-mistune==3.0.1
-    # via nbconvert
-mizani==0.9.2
-    # via plotnine
-nbclient==0.8.0
-    # via
-    #   ixmp
-    #   nbconvert
-nbconvert==7.7.3
-    # via
-    #   jupyter
-    #   jupyter-server
-nbformat==5.9.2
-    # via
-    #   jupyter-server
-    #   nbclient
-    #   nbconvert
-nest-asyncio==1.5.7
-    # via ipykernel
-notebook==7.0.2
-    # via jupyter
-notebook-shim==0.2.3
-    # via
-    #   jupyterlab
-    #   notebook
-numpy==1.23.5
-    # via
-    #   contourpy
-    #   dask
-    #   matplotlib
-    #   message-ix
-    #   mizani
-    #   pandas
-    #   patsy
-    #   plotnine
-    #   pyam-iamc
-    #   scipy
-    #   seaborn
-    #   statsmodels
-    #   wquantiles
-    #   xarray
-numpydoc==1.5.0
-    # via ixmp
-openpyxl==3.1.2
-    # via
-    #   ixmp
-    #   pyam-iamc
-overrides==7.4.0
-    # via jupyter-server
+    # via jinja2
 packaging==23.1
-    # via
-    #   dask
-    #   ipykernel
-    #   jpype1
-    #   jupyter-server
-    #   jupyterlab
-    #   jupyterlab-server
-    #   matplotlib
-    #   nbconvert
-    #   pooch
-    #   pytest
-    #   qtconsole
-    #   qtpy
-    #   setuptools-scm
-    #   sphinx
-    #   statsmodels
-    #   xarray
-pandas==2.0.3
-    # via
-    #   genno
-    #   ixmp
-    #   message-ix
-    #   mizani
-    #   plotnine
-    #   pyam-iamc
-    #   sdmx1
-    #   seaborn
-    #   statsmodels
-    #   xarray
-pandocfilters==1.5.0
-    # via nbconvert
-parso==0.8.3
-    # via jedi
-partd==1.4.0
-    # via dask
-patsy==0.5.3
-    # via
-    #   plotnine
-    #   statsmodels
-pexpect==4.8.0
-    # via ipython
-pickleshare==0.7.5
-    # via ipython
-pillow==10.0.0
-    # via matplotlib
-pint==0.22
-    # via
-    #   genno
-    #   iam-units
-    #   ixmp
-    #   pyam-iamc
-platformdirs==3.10.0
-    # via
-    #   jupyter-core
-    #   pooch
-plotnine==0.12.2
-    # via genno
-pluggy==1.2.0
-    # via pytest
-pooch==1.7.0
-    # via
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
-pretenders==1.4.5
-    # via ixmp
-prometheus-client==0.17.1
-    # via jupyter-server
-prompt-toolkit==3.0.39
-    # via
-    #   ipython
-    #   jupyter-console
-psutil==5.9.5
-    # via
-    #   ipykernel
-    #   memory-profiler
-ptyprocess==0.7.0
-    # via
-    #   pexpect
-    #   terminado
-pure-eval==0.2.2
-    # via stack-data
-py-cpuinfo==9.0.0
-    # via pytest-benchmark
-pyam-iamc==1.9.0
-    # via
-    #   genno
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
+    # via sphinx
 pybtex==0.24.0
     # via
     #   pybtex-docutils
     #   sphinxcontrib-bibtex
 pybtex-docutils==1.0.2
     # via sphinxcontrib-bibtex
-pycountry==22.3.5
-    # via
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
-pycparser==2.21
-    # via cffi
 pygments==2.16.1
-    # via
-    #   ipython
-    #   jupyter-console
-    #   nbconvert
-    #   qtconsole
-    #   sphinx
-pyjwt==2.8.0
-    # via pyam-iamc
-pyparsing==3.1.1
-    # via matplotlib
-pytest==7.4.0
-    # via
-    #   ixmp
-    #   message-ix-models
-    #   pytest-benchmark
-    #   pytest-cov
-    #   pytest-xdist
-pytest-benchmark==4.0.0
-    # via ixmp
-pytest-cov==4.1.0
-    # via
-    #   ixmp
-    #   message-ix-models
-pytest-xdist==3.3.1
-    # via message-ix-models
-python-dateutil==2.8.2
-    # via
-    #   arrow
-    #   jupyter-client
-    #   matplotlib
-    #   pandas
-    #   sdmx1
-python-json-logger==2.0.7
-    # via jupyter-events
-pytz==2023.3
-    # via pandas
+    # via sphinx
 pyyaml==6.0.1
-    # via
-    #   dask
-    #   genno
-    #   ixmp
-    #   jupyter-events
-    #   message-ix
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
-    #   pyam-iamc
-    #   pybtex
-pyzmq==25.1.0
-    # via
-    #   ipykernel
-    #   jupyter-client
-    #   jupyter-console
-    #   jupyter-server
-    #   qtconsole
-qtconsole==5.4.3
-    # via jupyter
-qtpy==2.3.1
-    # via qtconsole
-referencing==0.30.2
-    # via
-    #   jsonschema
-    #   jsonschema-specifications
-    #   jupyter-events
+    # via pybtex
 requests==2.31.0
-    # via
-    #   jupyterlab-server
-    #   pooch
-    #   pyam-iamc
-    #   sdmx1
-    #   sphinx
-rfc3339-validator==0.1.4
-    # via
-    #   jsonschema
-    #   jupyter-events
-rfc3986-validator==0.1.1
-    # via
-    #   jsonschema
-    #   jupyter-events
-rpds-py==0.9.2
-    # via
-    #   jsonschema
-    #   referencing
-scipy==1.11.1
-    # via
-    #   mizani
-    #   plotnine
-    #   pyam-iamc
-    #   statsmodels
-sdmx1==2.11.0
-    # via
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
-seaborn==0.12.2
-    # via pyam-iamc
-send2trash==1.8.2
-    # via jupyter-server
-setuptools-scm==7.1.0
-    # via pyam-iamc
+    # via sphinx
 six==1.16.0
     # via
-    #   asttokens
-    #   bleach
     #   latexcodec
-    #   patsy
-    #   pyam-iamc
     #   pybtex
-    #   python-dateutil
-    #   rfc3339-validator
-smmap==5.0.0
-    # via gitdb
-sniffio==1.3.0
-    # via
-    #   anyio
-    #   httpcore
-    #   httpx
 snowballstemmer==2.2.0
     # via sphinx
-soupsieve==2.4.1
-    # via beautifulsoup4
 sphinx==6.2.1
     # via
-    #   ixmp
-    #   message-ix-models (pyproject.toml)
-    #   numpydoc
+    #   -r requirements.in
     #   sphinx-rtd-theme
     #   sphinxcontrib-bibtex
     #   sphinxcontrib-jquery
 sphinx-rtd-theme==1.2.2
-    # via
-    #   ixmp
-    #   message-ix-models (pyproject.toml)
+    # via -r requirements.in
 sphinxcontrib-applehelp==1.0.4
     # via sphinx
 sphinxcontrib-bibtex==2.5.0
-    # via
-    #   ixmp
-    #   message-ix-models (pyproject.toml)
+    # via -r requirements.in
 sphinxcontrib-devhelp==1.0.2
     # via sphinx
 sphinxcontrib-htmlhelp==2.0.1
@@ -562,95 +72,5 @@ sphinxcontrib-qthelp==1.0.3
     # via sphinx
 sphinxcontrib-serializinghtml==1.1.5
     # via sphinx
-stack-data==0.6.2
-    # via ipython
-statsmodels==0.14.0
-    # via plotnine
-terminado==0.17.1
-    # via
-    #   jupyter-server
-    #   jupyter-server-terminals
-tinycss2==1.2.1
-    # via nbconvert
-tomli==2.0.1
-    # via
-    #   coverage
-    #   jupyterlab
-    #   pytest
-    #   setuptools-scm
-toolz==0.12.0
-    # via
-    #   dask
-    #   partd
-tornado==6.3.2
-    # via
-    #   ipykernel
-    #   jupyter-client
-    #   jupyter-server
-    #   jupyterlab
-    #   notebook
-    #   terminado
-tqdm==4.65.0
-    # via
-    #   message-ix-models
-    #   message-ix-models (pyproject.toml)
-traitlets==5.9.0
-    # via
-    #   comm
-    #   ipykernel
-    #   ipython
-    #   ipywidgets
-    #   jupyter-client
-    #   jupyter-console
-    #   jupyter-core
-    #   jupyter-events
-    #   jupyter-server
-    #   jupyterlab
-    #   matplotlib-inline
-    #   nbclient
-    #   nbconvert
-    #   nbformat
-    #   qtconsole
-typing-extensions==4.7.1
-    # via
-    #   async-lru
-    #   pint
-    #   sdmx1
-    #   setuptools-scm
-tzdata==2023.3
-    # via pandas
-uri-template==1.3.0
-    # via jsonschema
 urllib3==2.0.4
     # via requests
-wcwidth==0.2.6
-    # via prompt-toolkit
-webcolors==1.13
-    # via jsonschema
-webencodings==0.5.1
-    # via
-    #   bleach
-    #   tinycss2
-websocket-client==1.6.1
-    # via jupyter-server
-widgetsnbextension==4.0.8
-    # via ipywidgets
-wquantiles==0.6
-    # via pyam-iamc
-xarray==2023.7.0
-    # via
-    #   genno
-    #   ixmp
-xlsxwriter==3.1.2
-    # via pyam-iamc
-zipp==3.16.2
-    # via importlib-metadata
-
-# The following packages are considered to be unsafe in a requirements file:
-setuptools==68.0.0
-    # via
-    #   genno
-    #   iam-units
-    #   pyam-iamc
-    #   pycountry
-    #   setuptools-scm