diff --git a/setup.py b/setup.py
index 410b2dcd..c2910857 100644
--- a/setup.py
+++ b/setup.py
@@ -79,6 +79,6 @@ def find_version(fname):
     test_suite='tests',
     classifiers=CLASSIFIERS,
     scripts=['bin/num2words'],
-    install_requires=["docopt-ng>=0.8.0,<0.9.0"],
+    install_requires=["docopt-ng>=0.9.0,<1.0.0"],
     tests_require=['delegator.py'],
 )