diff --git a/doc/requirements.txt b/doc/requirements.txt
index 4afbea9..e0bca0c 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,5 @@
 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
-openstackdocstheme>=1.18.1 # Apache-2.0
+openstackdocstheme>=1.20.0 # Apache-2.0
 reno>=2.5.0 # Apache-2.0
 sphinxcontrib-apidoc>=0.2.0  # BSD
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 8f8b67e..1947082 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -18,7 +18,6 @@ except ImportError:
 repository_name = 'openstack/python-ironic-inspector-client'
 bug_project = 'python-ironic-inspector-client'
 bug_tag = ''
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 wsme_protocols = ['restjson']
 
@@ -45,17 +44,6 @@ master_doc = 'index'
 project = u'Ironic Inspector Client'
 copyright = u'OpenStack Foundation'
 
-# The version info for the project you're documenting, acts as replacement for
-# |version| and |release|, also used in various other places throughout the
-# built documents.
-#
-# The short X.Y version.
-from ironic_inspector_client import version as il_version
-# The full version, including alpha/beta/rc tags.
-release = il_version.version_info.release_string()
-# The short X.Y version.
-version = il_version.version_info.version_string()
-
 # A list of ignored prefixes for module index sorting.
 modindex_common_prefix = ['ironic_inspector_client']
 
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 7cc32b6..7658135 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -38,7 +38,7 @@ msgpack-python==0.4.0
 munch==2.1.0
 netaddr==0.7.18
 netifaces==0.10.4
-openstackdocstheme==1.18.1
+openstackdocstheme==1.20.0
 openstacksdk==0.11.2
 os-client-config==1.28.0
 os-service-types==1.2.0
diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index 6ce1337..ac7b522 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -61,7 +61,6 @@ source_suffix = '.rst'
 master_doc = 'index'
 
 # General information about the project.
-project = u'Ironic Inspector Client Release Notes'
 copyright = u'2015, Ironic Inspector Developers'
 
 # Release notes are version independent.
@@ -199,17 +198,6 @@ htmlhelp_basename = 'IronicInspectorClientReleaseNotesdoc'
 
 # -- Options for LaTeX output ---------------------------------------------
 
-latex_elements = {
-    # The paper size ('letterpaper' or 'a4paper').
-    # 'papersize': 'letterpaper',
-
-    # The font size ('10pt', '11pt' or '12pt').
-    # 'pointsize': '10pt',
-
-    # Additional stuff for the LaTeX preamble.
-    # 'preamble': '',
-}
-
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).