diff --git a/doc/environment.yml b/doc/environment.yml
index 872334b..2fc93b4 100644
--- a/doc/environment.yml
+++ b/doc/environment.yml
@@ -2,38 +2,38 @@ name: geopandas_docs
 channels:
   - conda-forge
 dependencies:
-  - python=3.9.1
-  - pandas=1.2.2
+  - python=3.9.5
+  - pandas=1.2.5
   - shapely=1.7.1
   - fiona=1.8.18
-  - pyproj=3.0.0.post1
+  - pyproj=3.1.0
   - rtree=0.9.7
   - geopy=2.1.0
-  - matplotlib=3.3.4
+  - matplotlib=3.4.2
   - mapclassify=2.4.2
-  - sphinx=3.5.1
-  - pydata-sphinx-theme=0.5.0
+  - sphinx>=4.0.2
+  - pydata-sphinx-theme=0.6.3
   - numpydoc=1.1.0
-  - ipython=7.20.0
-  - pillow=8.1.0
+  - ipython=7.25.0
+  - pillow=8.2.0
   - mock=4.0.3
-  - cartopy=0.18.0
+  - cartopy=0.19.0.post1
   - pyepsg=0.4.0
   - contextily=1.1.0
-  - rasterio=1.2.0
+  - rasterio=1.2.6
   - geoplot=0.4.1
-  - sphinx-gallery=0.8.2
-  - jinja2=2.11.3
+  - sphinx-gallery=0.9.0
+  - jinja2=3.0.1
   - doc2dash=2.3.0
   # specify additional dependencies to reduce solving for conda
-  - gdal=3.1.4
-  - libgdal=3.1.4
+  - gdal=3.2.1
+  - libgdal=3.2.1
   - proj=7.2.0
-  - geos=3.9.0
-  - nbsphinx=0.8.1
-  - jupyter_client=6.1.11
-  - ipykernel=5.4.3
-  - myst-parser=0.13.5
+  - geos=3.9.1
+  - nbsphinx=0.8.6
+  - jupyter_client=6.1.12
+  - ipykernel=5.5.5
+  - myst-parser=0.15.1
   - folium=0.12.0
   - libpysal=4.4.0
   - pygeos=0.10
diff --git a/doc/source/conf.py b/doc/source/conf.py
index e85390c..44a6827 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -36,8 +36,8 @@ extensions = [
     "myst_parser",
     "nbsphinx",
     "numpydoc",
-    'sphinx_toggleprompt',
-    "matplotlib.sphinxext.plot_directive"
+    "sphinx_toggleprompt",
+    "matplotlib.sphinxext.plot_directive",
 ]
 
 # continue doc build and only print warnings/errors in examples
@@ -54,7 +54,7 @@ numpydoc_show_class_members = False
 
 
 def setup(app):
-    app.add_stylesheet("custom.css")  # may also be an URL
+    app.add_css_file("custom.css")  # may also be an URL
 
 
 # Add any paths that contain templates here, relative to this directory.
@@ -355,16 +355,16 @@ intersphinx_mapping = {
         "https://pygeos.readthedocs.io/en/latest/objects.inv",
     ),
     "rtree": (
-      "https://rtree.readthedocs.io/en/stable/",
-      "https://rtree.readthedocs.io/en/stable/objects.inv",
+        "https://rtree.readthedocs.io/en/stable/",
+        "https://rtree.readthedocs.io/en/stable/objects.inv",
     ),
     "mapclassify": (
         "https://pysal.org/mapclassify/",
-        "https://pysal.org/mapclassify/objects.inv"
+        "https://pysal.org/mapclassify/objects.inv",
     ),
     "libpysal": (
         "https://pysal.org/libpysal/",
-        "https://pysal.org/libpysal/objects.inv"
+        "https://pysal.org/libpysal/objects.inv",
     ),
     "matplotlib": (
         "https://matplotlib.org/stable/",
@@ -376,30 +376,27 @@ intersphinx_mapping = {
     ),
     "cartopy": (
         "https://scitools.org.uk/cartopy/docs/latest/",
-        "https://scitools.org.uk/cartopy/docs/latest/objects.inv"
+        "https://scitools.org.uk/cartopy/docs/latest/objects.inv",
     ),
     "pyepsg": (
         "https://pyepsg.readthedocs.io/en/stable/",
-        "https://pyepsg.readthedocs.io/en/stable/objects.inv"
+        "https://pyepsg.readthedocs.io/en/stable/objects.inv",
     ),
     "contextily": (
         "https://contextily.readthedocs.io/en/stable/",
-        "https://contextily.readthedocs.io/en/stable/objects.inv"
+        "https://contextily.readthedocs.io/en/stable/objects.inv",
     ),
     "rasterio": (
         "https://rasterio.readthedocs.io/en/stable/",
-        "https://rasterio.readthedocs.io/en/stable/objects.inv"
+        "https://rasterio.readthedocs.io/en/stable/objects.inv",
     ),
     "geoplot": (
         "https://residentmario.github.io/geoplot/index.html",
-        "https://residentmario.github.io/geoplot/objects.inv"
+        "https://residentmario.github.io/geoplot/objects.inv",
     ),
     "folium": (
         "https://python-visualization.github.io/folium/",
-        "https://python-visualization.github.io/folium/objects.inv"
+        "https://python-visualization.github.io/folium/objects.inv",
     ),
-    "python": (
-        "https://docs.python.org/3",
-        "https://docs.python.org/3/objects.inv"
-    )
+    "python": ("https://docs.python.org/3", "https://docs.python.org/3/objects.inv"),
 }