diff --git a/setup.py b/setup.py
index dad12e40..2d6b6315 100755
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,10 @@ def run_tests(self):
     packages=[
         'pyhocon',
     ],
-    install_requires=['pyparsing~=2.0'],
+    install_requires=[
+        'pyparsing~=2.0;python_version<"3.0"',
+        'pyparsing>=2,<4;python_version>="3.0"',
+    ],
     extras_require={
         'Duration': ['python-dateutil>=2.8.0']
     },