diff --git a/readthedocs-pip-requirements.txt b/readthedocs-pip-requirements.txt
index 59e9544..64e2152 100644
--- a/readthedocs-pip-requirements.txt
+++ b/readthedocs-pip-requirements.txt
@@ -1 +1,5 @@
-numpydoc==0.4
+numpydoc>=0.4
+requests>=2.2.1
+pytz>=2014.2
+
+