diff --git a/setup.py b/setup.py
index 8bcab12..a310ef7 100755
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@ def get_version():
 
 extras_require = {'fast': []}
 if is_cpython:
-    extras_require['fast'].append("DAWG2 >= 0.9.0")
+    extras_require['fast'].append("DAWG2 >= 0.9.0, < 1.0.0")
 
 setup(
     name='pymorphy2',