diff --git a/sphinx_immaterial/apidoc/generic_synopses.py b/sphinx_immaterial/apidoc/generic_synopses.py
index 3f0a5466..e572a005 100644
--- a/sphinx_immaterial/apidoc/generic_synopses.py
+++ b/sphinx_immaterial/apidoc/generic_synopses.py
@@ -50,7 +50,7 @@ def after_content(self: GenericObject) -> None:
 
     orig_merge_domaindata = StandardDomain.merge_domaindata
 
-    def merge_domaindata(self, docnames: List[str], otherdata: dict) -> None:
+    def merge_domaindata(self, docnames, otherdata: dict) -> None:
         orig_merge_domaindata(self, docnames, otherdata)
         self.data["synopses"].update(otherdata["synopses"])
 
diff --git a/sphinx_immaterial/apidoc/json/domain.py b/sphinx_immaterial/apidoc/json/domain.py
index 4ad2aef8..3e1eed4c 100644
--- a/sphinx_immaterial/apidoc/json/domain.py
+++ b/sphinx_immaterial/apidoc/json/domain.py
@@ -1150,7 +1150,7 @@ def get_objects(self) -> Iterator[Tuple[str, str, str, str, str, int]]:
                 else OBJECT_PRIORITY_UNIMPORTANT,
             )
 
-    def merge_domaindata(self, docnames: List[str], otherdata: Dict) -> None:
+    def merge_domaindata(self, docnames, otherdata: Dict) -> None:
         self.schemas.update(otherdata["schemas"])
 
     def _find_schema(
diff --git a/sphinx_immaterial/apidoc/python/synopses.py b/sphinx_immaterial/apidoc/python/synopses.py
index 714ec29d..f1abed4d 100644
--- a/sphinx_immaterial/apidoc/python/synopses.py
+++ b/sphinx_immaterial/apidoc/python/synopses.py
@@ -130,7 +130,7 @@ def after_content(self: PyObject) -> None:
 
     orig_merge_domaindata = PythonDomain.merge_domaindata
 
-    def merge_domaindata(self, docnames: List[str], otherdata: dict) -> None:
+    def merge_domaindata(self, docnames, otherdata: dict) -> None:
         orig_merge_domaindata(self, docnames, otherdata)
         self.data["synopses"].update(otherdata["synopses"])
 
diff --git a/sphinx_immaterial/local_mathjax.py b/sphinx_immaterial/local_mathjax.py
index 7c97482c..daea3d62 100644
--- a/sphinx_immaterial/local_mathjax.py
+++ b/sphinx_immaterial/local_mathjax.py
@@ -4,7 +4,8 @@
 from sphinx.application import Sphinx
 from sphinx.config import Config
 from sphinx.errors import ExtensionError
-from sphinx.ext.mathjax import MATHJAX_URL, MathDomain
+from sphinx.domains.math import MathDomain
+from sphinx.ext.mathjax import MATHJAX_URL
 from sphinx.environment import BuildEnvironment