diff --git a/docs/conf.py b/docs/conf.py
index 9bc0c489..8c9f0efa 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -12,8 +12,8 @@
 #
 import os
 import sys
-import pkg_resources
 import datetime
+import importlib.metadata
 
 source_dir = os.path.dirname(__file__)
 pkg_dir = os.path.join(source_dir, '..', '..', 'src', 'highdicom')
@@ -23,14 +23,15 @@
 
 project = 'highdicom'
 copyright = f'2020-{datetime.datetime.now().year}, highdicom contributors'
-author = 'Markus D. Herrmann'
+author = 'Markus D. Herrmann, Christopher P. Bridge'
 
 # The full version, including alpha/beta/rc tags
 try:
-    release = pkg_resources.get_distribution('highdicom').version
-except pkg_resources.DistributionNotFound:
+    release = importlib.metadata.version("highdicom")
+except importlib.metadata.PackageNotFoundError:
     print('Package "highdicom" must be installed to build docs.')
     sys.exit(1)
+
 # The short X.Y version
 version = '.'.join(release.split('.')[:2])
 
@@ -48,7 +49,7 @@
     'sphinxcontrib.autoprogram',
     'sphinx.ext.autodoc',
     'sphinx.ext.napoleon',
-    'sphinx_autodoc_typehints',
+    # 'sphinx_autodoc_typehints',
     'sphinx.ext.extlinks',
 ]
 
diff --git a/pyproject.toml b/pyproject.toml
index d161a276..c9469dd7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,11 +56,11 @@ test = [
     "pytest-flake8==1.3.0",
 ]
 docs = [
-    "sphinx-autodoc-typehints==1.17.0",
-    "sphinx-pyreverse==0.0.17",
-    "sphinx-rtd-theme==1.0.0",
-    "sphinxcontrib-autoprogram==0.1.7",
-    "sphinxcontrib-websupport==1.2.4",
+    "sphinx-autodoc-typehints==3.9.9",
+    "sphinx-pyreverse==0.0.18",
+    "sphinx-rtd-theme==3.1.0",
+    "sphinxcontrib-autoprogram==0.1.9",
+    "sphinxcontrib-websupport==2.0.0",
 ]
 
 [project.urls]
diff --git a/src/highdicom/seg/sop.py b/src/highdicom/seg/sop.py
index 6399856a..44f91238 100644
--- a/src/highdicom/seg/sop.py
+++ b/src/highdicom/seg/sop.py
@@ -218,7 +218,7 @@ def __init__(
         """
         Parameters
         ----------
-        source_images: Sequence[Dataset]
+        source_images: Sequence[pydicom.Dataset]
             Image(s) from which this segmentation was derived. A sequence
             containing either one or more single-frame images, or exactly one
             multi-frame image. Passing the metadata of the image(s) is