diff --git a/doc/source/conf.py b/doc/source/conf.py
index ca88ab80..6e2377f7 100755
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -22,7 +22,7 @@ sys.path.insert(0, os.path.abspath('../..'))
 extensions = [
     'sphinx.ext.autodoc',
     #'sphinx.ext.intersphinx',
-    'oslosphinx'
+    'openstackdocstheme',
 ]
 
 # autodoc generation is a bit aggressive and a nuisance when doing heavy
@@ -53,13 +53,17 @@ pygments_style = 'sphinx'
 
 # The theme to use for HTML and HTML Help pages.  Major themes that come with
 # Sphinx are currently 'default' and 'sphinxdoc'.
-# html_theme_path = ["."]
-# html_theme = '_theme'
 # html_static_path = ['static']
+html_theme = 'openstackdocs'
 
 # Output file base name for HTML help builder.
 htmlhelp_basename = '%sdoc' % project
 
+# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
+# using the given strftime format.
+# html_last_updated_fmt = '%b %d, %Y'
+html_last_updated_fmt = '%Y-%m-%d %H:%M'
+
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass
 # [howto/manual]).
@@ -72,3 +76,8 @@ latex_documents = [
 
 # Example configuration for intersphinx: refer to the Python standard library.
 #intersphinx_mapping = {'https://docs.python.org/3/': None}
+
+# -- Options for openstackdocstheme -------------------------------------------
+repository_name = 'openstack/castellan'
+bug_project = 'castellan'
+bug_tag = ''
diff --git a/test-requirements.txt b/test-requirements.txt
index 9f830520..3637e7a6 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,7 +7,7 @@ coverage!=4.4,>=4.0 # Apache-2.0
 python-barbicanclient>=4.0.0 # Apache-2.0
 python-subunit>=0.0.18 # Apache-2.0/BSD
 sphinx>=1.6.2 # BSD
-oslosphinx>=4.7.0 # Apache-2.0
+openstackdocstheme>=1.11.0 # Apache-2.0
 oslotest>=1.10.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD