diff --git a/setup.py b/setup.py
index 1b2d306a4..9723fb62e 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
     license='GPLv3',
     packages=find_packages(exclude=['doc', 'test']),
     include_package_data=True,
-    install_requires=['numpy','pyomo','scipy','pandas>=0.19.0','networkx>=1.10'],
+    install_requires=['numpy','pyomo>=5.3','scipy','pandas>=0.19.0','networkx>=1.10'],
     classifiers=[
         'Development Status :: 3 - Alpha',
         'Environment :: Console',