diff --git a/setup.py b/setup.py
index 59f7617..4b33f5f 100644
--- a/setup.py
+++ b/setup.py
@@ -1,8 +1,8 @@
 from setuptools import setup, find_packages
 
 required_packages = [
-    'graphql-core>=2.1',
-    'graphql-server-core>=1.1.1',
+    'graphql-core>=2.1,<3',
+    'graphql-server-core>=1.1.1,<2',
     'sanic>=0.5.1',
     'pytest-runner'
 ]