diff --git a/setup.cfg b/setup.cfg
index bccff8a..34e51b5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -5,5 +5,5 @@ max-line-length = 160
 [isort]
 known_first_party=graphql
 
-[pytest]
+[tool:pytest]
 norecursedirs = venv .tox .cache
diff --git a/tox.ini b/tox.ini
index 17feeca..303a459 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,8 +8,8 @@ setenv =
 deps =
     pytest>=2.7.2
     pytest-flask>=0.10.0
-    graphql-core>=2.1
-    graphql-server-core>=1.1
+    graphql-core>=2.1,<3
+    graphql-server-core>=1.1,<2
     Flask>=0.10.0
     pytest-cov
 commands =