diff --git a/noxfile.py b/noxfile.py
index 7d572f9..2c5f802 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -165,7 +165,7 @@ def xdoctest(session: Session) -> None:
     session.run("python", "-m", "xdoctest", package, *args)
 
 
-@session(name="docs-build", python="3.8")
+@session(name="docs-build", python="3.9")
 def docs_build(session: Session) -> None:
     """Build the documentation."""
     args = session.posargs or ["docs", "docs/_build"]
@@ -179,7 +179,7 @@ def docs_build(session: Session) -> None:
     session.run("sphinx-build", *args)
 
 
-@session(python="3.8")
+@session(python="3.9")
 def docs(session: Session) -> None:
     """Build and serve the documentation with live reloading on file changes."""
     args = session.posargs or ["--open-browser", "docs", "docs/_build"]