diff --git a/setup.py b/setup.py
index 9a975a0..9ebb9bf 100644
--- a/setup.py
+++ b/setup.py
@@ -7,6 +7,6 @@
     version='1.0.0',
     packages=find_packages(),
     install_requires=[
-        'elasticsearch>=5.4.0', 'requests>=2.18.4', 'simplejson>=3.11.1'
+        'elasticsearch>=1.0.0,<2.0.0', 'requests>=2.18.4', 'simplejson>=3.11.1'
     ]
 )