diff --git a/build_helpers/build_helpers.py b/build_helpers/build_helpers.py
index 25b057055..6609bfd19 100644
--- a/build_helpers/build_helpers.py
+++ b/build_helpers/build_helpers.py
@@ -148,7 +148,7 @@ def run(self) -> None:  # type: ignore
 
 class SDistCommand(sdist.sdist):  # pragma: no cover
     def run(self) -> None:
-        if not self.dry_run:  # type: ignore
+        if not self.dry_run:
             self.run_command("clean")
             run_antlr(self)
         sdist.sdist.run(self)
diff --git a/noxfile.py b/noxfile.py
index db547cb30..9b4d4bfdf 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -90,9 +90,6 @@ def test_jupyter_notebook(session: Session) -> None:
             # Ignore deprecation warnings raised by jupyter_client in Python 3.10
             # https://github.com/jupyter/jupyter_client/issues/713
             "-Wdefault:There is no current event loop:DeprecationWarning",
-            # Block warning issued by nbval
-            # https://github.com/computationalmodelling/nbval/issues/180
-            "-Wdefault::pytest.PytestRemovedIn8Warning",
         ]
     )
     session.run(