diff --git a/api-ref/source/conf.py b/api-ref/source/conf.py
index cf3fe67db..84753bcc2 100644
--- a/api-ref/source/conf.py
+++ b/api-ref/source/conf.py
@@ -27,8 +27,6 @@
 import os
 import sys
 
-from murano.version import version_info
-
 extensions = [
     'os_api_ref',
     'openstackdocstheme'
@@ -44,7 +42,6 @@ html_theme_options = {
 repository_name = 'openstack/murano'
 bug_project = 'murano'
 bug_tag = 'api-ref'
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -69,18 +66,8 @@ source_suffix = '.rst'
 master_doc = 'index'
 
 # General information about the project.
-project = u'Application Catalog API Reference'
 copyright = u'2016-present, 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 full version, including alpha/beta/rc tags.
-release = version_info.release_string()
-# The short X.Y version.
-version = version_info.version_string()
-
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #
diff --git a/doc/requirements.txt b/doc/requirements.txt
index ece35108e..633e2aff9 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -3,5 +3,5 @@ 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
 sphinxcontrib-httpdomain>=1.3.0 # BSD
 reno>=2.5.0 # Apache-2.0
-openstackdocstheme>=1.18.1 # Apache-2.0
+openstackdocstheme>=1.20.0 # Apache-2.0
 os-api-ref>=1.4.0 # Apache-2.0
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 4cb38701c..bdf77afee 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -13,9 +13,7 @@
 #    under the License.
 
 import os
-import subprocess
 import sys
-import warnings
 
 on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
 
@@ -56,14 +54,10 @@ source_suffix = '.rst'
 # The master toctree document.
 master_doc = 'index'
 
-# General information about the project.
-project = 'Murano'
-
 # openstackdocstheme options
 repository_name = 'openstack/murano'
 bug_project = 'murano'
 bug_tag = ''
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 config_generator_config_file = '../../etc/oslo-config-generator/murano.conf'
 sample_config_basename = '_static/murano'
@@ -73,13 +67,6 @@ policy_generator_config_file = [
      '_static/murano'),
 ]
 
-# 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.
-from murano.version import version_info
-release = version_info.release_string()
-version = version_info.version_string()
-
 # Set the default Pygments syntax
 highlight_language = 'python'
 
diff --git a/lower-constraints.txt b/lower-constraints.txt
index b1640a347..ddb9f5d84 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -59,7 +59,7 @@ murano-pkg-check==0.3.0
 netaddr==0.7.18
 netifaces==0.10.6
 nose==1.3.7
-openstackdocstheme==1.18.1
+openstackdocstheme==1.20.0
 openstacksdk==0.12.0
 os-api-ref==1.4.0
 os-client-config==1.29.0
diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index 5c96e8513..892b6dd2c 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -55,23 +55,16 @@ source_suffix = '.rst'
 master_doc = 'index'
 
 # General information about the project.
-project = u'Murano Release Notes'
 copyright = u'2015, Murano Developers'
 
 # openstackdocstheme options
 repository_name = 'openstack/murano'
 bug_project = 'murano'
 bug_tag = ''
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 # Release notes are version independent.
 # The short X.Y version.
 
-# The full version, including alpha/beta/rc tags.
-release = ''
-# The short X.Y version.
-version = ''
-
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 # language = None
@@ -198,17 +191,6 @@ htmlhelp_basename = 'MuranoReleaseNotesdoc'
 
 # -- 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]).