diff --git a/setup.py b/setup.py
index 84c0c48405..373ed7e43e 100644
--- a/setup.py
+++ b/setup.py
@@ -75,7 +75,7 @@ setup(
         'humanize',
         'idna',
         'isodate',
-        'markdown',
+        'markdown<3.0.0',
         'pandas>=0.18.0',
         'parsedatetime',
         'pathlib2',