diff --git a/requirements.txt b/requirements.txt
index 5c59f63..09139d7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-Sphinx==1.2.2
-cachetools==2.0.0
+Sphinx>=1.2.2
+cachetools>=2.0.0