diff --git a/pyproject.toml b/pyproject.toml
index 2a3b95b..9e0c771 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -111,6 +111,12 @@ Documentation = "https://czml3.readthedocs.io/en"
 [tool.setuptools.dynamic]
 version = {attr = "czml3.__version__"}
 
+[tool.setuptools.package-data]
+"czml3" = ["py.typed"]
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
 [tool.mypy]
 files = [
     "src/**/*.py",
diff --git a/src/czml3/__init__.py b/src/czml3/__init__.py
index 96a18e6..8ce3ea3 100644
--- a/src/czml3/__init__.py
+++ b/src/czml3/__init__.py
@@ -1,5 +1,5 @@
 from .core import CZML_VERSION, Document, Packet
 
-__version__ = "2.3.3"
+__version__ = "2.3.4"
 
 __all__ = ["Document", "Packet", "CZML_VERSION"]
diff --git a/src/czml3/py.typed b/src/czml3/py.typed
new file mode 100644
index 0000000..e69de29