diff --git a/setup.py b/setup.py
index 40b6668..4cecdd7 100644
--- a/setup.py
+++ b/setup.py
@@ -50,6 +50,6 @@
         'yaml', 'block', 'flow', 'readable',
     ],
     install_requires=[
-        'PyYAML >= 3.11, <= 3.13',
+        'PyYAML >= 3.11',
     ],
 )