diff --git a/setup.py b/setup.py
index 4c2d757..4687ed0 100644
--- a/setup.py
+++ b/setup.py
@@ -92,7 +92,7 @@ def run(self):
     use_2to3=True,
     data_files=[('etc/udunits', xml_files),],
     install_requires = [
-        'numexpr==2.1',
+        'numexpr==2.8.5',
         'pytest==2.3.2',
         'pytest-cov==1.6',
     ],