diff --git a/setup.py b/setup.py
index 4d9a2c1..c3081c0 100644
--- a/setup.py
+++ b/setup.py
@@ -84,7 +84,7 @@ dependency_links = {
             },
 }
 
-requires = ['oyaml']
+requires = ['oyaml', 'pyyaml>=6.0']
 for dep in info.get('depends', []):
     if not re.match(r'(ir|res)(\W|$)', dep):
         prefix = MODULE2PREFIX.get(dep, 'trytond')