diff --git a/setup.py b/setup.py
index 4faec8a8..acd17ca2 100644
--- a/setup.py
+++ b/setup.py
@@ -46,6 +46,7 @@ setup(
     license="LGPL",
     platforms='any',
     keywords="HDL ASIC FPGA hardware design",
+    python_requires='>=3.4',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',