diff --git a/docs/docs-requirements.txt b/docs/docs-requirements.txt
index e4ec81c7..f0bddf36 100644
--- a/docs/docs-requirements.txt
+++ b/docs/docs-requirements.txt
@@ -1,3 +1,4 @@
 Sphinx==1.7.1
 sphinx-autobuild==0.6.0 # Last version to support Python 2.6
 sphinxcontrib-programoutput==0.11
+alabaster==0.7.10