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-rw-r--r--doc/requirements.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/requirements.txt b/doc/requirements.txt
index 16c92c31e..6a53c2c3b 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -2,7 +2,8 @@ mock>=2.0.0 # BSD
openstackdocstheme>=1.18.1 # Apache-2.0
os-api-ref>=1.4.0 # Apache-2.0
reno>=2.5.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4' # BSD
sphinxcontrib-apidoc>=0.2.0 # BSD
sphinxcontrib-pecanwsme>=0.8.0 # Apache-2.0
sphinxcontrib-seqdiag>=0.8.4 # BSD