diff --git a/setup.py b/setup.py
index d41f110..60d91cc 100644
--- a/setup.py
+++ b/setup.py
@@ -86,6 +86,7 @@ def find_version(*file_paths):
         'openpyxl>=2.5,<4',
         'colour>=0.1.5,<0.2',
         'jsonschema',
-        'pandas<2'
+        'pandas<2',
+        "xlrd>=1.0.0,<1.3.0 ; python_version<='3.6'"
     ]
 )