diff --git a/setup.py b/setup.py
index 7ea67c7..f0195f8 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@ setup(
     install_requires = [
         'SQLAlchemy>=0.9.7',
         'whoosh>=2.5,<2.7',
-        'markdown',
+        'markdown==2.4.1',
         'construct',
         'six>=1.9.0',
     ],