diff --git a/pyproject.toml b/pyproject.toml
index b7ecc10f..5b520d0b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,7 +62,7 @@ sphinxcontrib-programoutput = { version = '*', optional = true }
 plotting = ['cartopy', 'cmocean', 'matplotlib']
 testing = ['pytest', 'pytest-cov', 'pytest-socket', 'pytest-xdist', 'wget']
 development = ['isort', 'oitnb']
-documentation = ['dunamai', 'm2r2', 'sphinx', 'sphinx-rtd-theme', 'sphinxcontrib-programoutput', 'sphinxcontrib-bibtex', 'cartopy']
+documentation = ['dunamai', 'm2r2', 'sphinx', 'sphinx-rtd-theme', 'sphinxcontrib-programoutput', 'sphinxcontrib-bibtex', 'cartopy', 'cmocean', 'matplotlib']
 
 [tool.poetry.scripts]
 make_storm_ensemble = 'ensembleperturbation.client.make_storm_ensemble:main'