diff --git a/tensorboard/pip_package/setup.py b/tensorboard/pip_package/setup.py
index 6279dcacf6..6f9b7d3085 100644
--- a/tensorboard/pip_package/setup.py
+++ b/tensorboard/pip_package/setup.py
@@ -64,6 +64,7 @@ def get_readme():
     },
     install_requires=REQUIRED_PACKAGES,
     tests_require=REQUIRED_PACKAGES,
+    python_requires=">=3.6",
     # PyPI package information.
     classifiers=[
         "Development Status :: 4 - Beta",