diff --git a/requirements.txt b/requirements.txt
index 2e2b0219affecd11ae4d3262493d926dab28bae5..ea78408c78857284bdab6cef684c56b659add5e1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,5 @@
 setuptools
 six
-sphinx
 numpy
 bob.extension
 bob.bio.base