diff --git a/api-ref/source/conf.py b/api-ref/source/conf.py
index 1c33ca758..63ac5dc82 100644
--- a/api-ref/source/conf.py
+++ b/api-ref/source/conf.py
@@ -12,7 +12,6 @@
 # limitations under the License.
 
 import os
-import subprocess
 import sys
 
 
@@ -56,13 +55,6 @@ master_doc = 'index'
 project = u'Workflow Service API Reference'
 copyright = u'2017, Mistral Contributors'
 
-# 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 mistral.version import version_info
-release = version_info.release_string()
-version = version_info.version_string()
-
 # If true, sectionauthor and moduleauthor directives will be shown in the
 # output. They are ignored by default.
 show_authors = False
@@ -75,7 +67,7 @@ add_function_parentheses = True
 add_module_names = True
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 # -- Options for HTML output --------------------------------------------------
 
@@ -93,14 +85,6 @@ htmlhelp_basename = '%sdoc' % project
 # A list of ignored prefixes for module index sorting.
 modindex_common_prefix = ['mistral.']
 
-# 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'
-git_cmd = ["git", "log", "--pretty=format:'%ad, commit %h'", "--date=local",
-           "-n1"]
-html_last_updated_fmt = subprocess.check_output(
-    git_cmd).decode('utf-8')
-
 # The name for this set of Sphinx documents. If None, it defaults to
 # "<project> v<release> documentation".
 html_title = 'Mistral API Reference'
diff --git a/doc/requirements.txt b/doc/requirements.txt
index a918df6bc..595c1838f 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,6 +1,6 @@
-sphinx>=1.8.0,!=2.1.0,!=3.0.0;python_version>='3.4' # BSD
+sphinx>=2.0.0,!=2.1.0 # BSD
 sphinxcontrib-httpdomain>=1.3.0 # BSD
 sphinxcontrib-pecanwsme>=0.8.0 # Apache-2.0
-openstackdocstheme>=1.30.0 # Apache-2.0
+openstackdocstheme>=2.2.1 # Apache-2.0
 os-api-ref>=1.4.0 # Apache-2.0
-reno>=2.5.0 # Apache-2.0
+reno>=3.1.0 # Apache-2.0
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 5a7b51271..af61bd7ae 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -74,7 +74,7 @@ add_function_parentheses = True
 add_module_names = True
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 # -- Options for HTML output --------------------------------------------------
 
@@ -105,9 +105,11 @@ man_show_urls = True
 
 # -- Options for openstackdocstheme -------------------------------------------
 
-repository_name = 'openstack/mistral'
-bug_project = 'mistral'
-bug_tag = 'doc'
+openstackdocs_repo_name = 'openstack/mistral'
+openstackdocs_pdf_link = True
+openstackdocs_auto_name = False
+openstackdocs_bug_project = 'mistral'
+openstackdocs_bug_tag = 'doc'
 
 latex_use_xindy = False
 
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 170894744..1b54a54f4 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -13,8 +13,7 @@ keystonemiddleware==4.18.0
 kombu==4.6.1
 mistral-lib==1.4.0
 mock==2.0.0
-networkx==2.3;python_version>='3.4'
-networkx==1.10;python_version<'3.0'
+networkx==2.3
 nose==1.3.7
 oslo.concurrency==3.26.0
 oslo.config==5.2.0
@@ -37,14 +36,9 @@ pecan==1.2.1
 Pygments==2.2.0
 PyJWT==1.5
 PyYAML==5.1
-reno==2.5.0
 requests-mock==1.2.0
 requests==2.14.2
 six==1.10.0
-Sphinx==1.8.0
-sphinxcontrib-httpdomain==1.3.0
-sphinxcontrib-pecanwsme==0.10.0
-sphinxcontrib-websupport==1.0.1
 SQLAlchemy==1.2.5
 stestr==2.0.0
 stevedore==1.20.0
diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index ea5066d97..670f7525c 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -92,7 +92,7 @@ exclude_patterns = []
 # show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 # A list of ignored prefixes for module index sorting.
 # modindex_common_prefix = []
@@ -141,11 +141,6 @@ html_theme = 'openstackdocs'
 # directly to the root of the documentation.
 # html_extra_path = []
 
-# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
-# using the given strftime format.
-# Must set this variable to include year, month, day, hours, and minutes.
-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
@@ -270,6 +265,7 @@ texinfo_documents = [
 locale_dirs = ['locale/']
 
 # -- Options for openstackdocstheme -------------------------------------------
-repository_name = 'openstack/mistral'
-bug_project = 'mistral'
-bug_tag = ''
+openstackdocs_repo_name = 'openstack/mistral'
+openstackdocs_auto_name = False
+openstackdocs_bug_project = 'mistral'
+openstackdocs_bug_tag = ''
diff --git a/requirements.txt b/requirements.txt
index e2c1a283e..bccf00768 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,8 +13,7 @@ jsonschema>=2.6.0 # MIT
 keystonemiddleware>=4.18.0 # Apache-2.0
 kombu!=4.0.2,>=4.6.1 # BSD
 mistral-lib>=1.4.0 # Apache-2.0
-networkx<2.3,>=1.10;python_version<'3.0'  # BSD
-networkx>=2.3;python_version>='3.4'  # BSD
+networkx>=2.3 # BSD
 oslo.concurrency>=3.26.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslo.context>=2.20.0 # Apache-2.0