diff --git a/docs/requirements.txt b/docs/requirements.txt
index b322aa58..542ff3d2 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
-Sphinx==1.3.5
-sphinxcontrib-napoleon==0.4.4
+Sphinx>=1.3.5
+recommonmark>=0.4.0
 sphinx-rtd-theme>=0.1.9
-recommonmark
-sphinxcontrib-httpdomain==1.5.0
+sphinxcontrib-napoleon>=0.4.4
+sphinxcontrib-httpdomain>=1.5.0
diff --git a/setup.py b/setup.py
index 602bd184..a6539a34 100644
--- a/setup.py
+++ b/setup.py
@@ -45,10 +45,11 @@ dev_require = [
 ]
 
 docs_require = [
-    'recommonmark>=0.4.0',
     'Sphinx>=1.3.5',
-    'sphinxcontrib-napoleon>=0.4.4',
+    'recommonmark>=0.4.0',
     'sphinx-rtd-theme>=0.1.9',
+    'sphinxcontrib-napoleon>=0.4.4',
+    'sphinxcontrib-httpdomain>=1.5.0',
 ]
 
 benchmarks_require = [