diff --git a/doc/requirements.txt b/doc/requirements.txt
index b0b2fae2ab..29695ca4a1 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,4 +1,3 @@
 # this is required for the docs build jobs
-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,!=2.1.0,>=1.6.2;python_version>='3.4' # BSD
-openstackdocstheme>=1.18.1 # Apache-2.0
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
+openstackdocstheme>=1.31.2 # Apache-2.0
diff --git a/doc/source/conf.py b/doc/source/conf.py
index f5f36c2184..16ec627208 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -112,10 +112,6 @@ html_theme = 'openstackdocs'
 # pixels large.
 #html_favicon = None
 
-# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
-# using the given strftime format.
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
-
 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.
 #html_use_smartypants = True