diff --git a/requirements.txt b/requirements.txt
index 63b9017..c0c3125 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 pbr>=1.8 # Apache-2.0
 oslosphinx>=4.7.0 # Apache-2.0
-sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
+sphinx>=1.6.2,!=1.6.6  # BSD
 yasfb>=0.5.1