diff --git a/pyproject.toml b/pyproject.toml
index 8cc66d0..5a34e38 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,6 +11,7 @@ classifiers = [
     "Framework :: Jupyter",
     "Framework :: Jupyter :: JupyterLab",
     "Framework :: Jupyter :: JupyterLab :: 3",
+    "Framework :: Jupyter :: JupyterLab :: 4",
     "Framework :: Jupyter :: JupyterLab :: Extensions",
     "Framework :: Jupyter :: JupyterLab :: Extensions :: Prebuilt",
     "License :: OSI Approved :: BSD License",