diff --git a/docs/conf.py b/docs/conf.py
index fc96b8b..83601da 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -137,7 +137,7 @@
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-#html_theme_options = {}
+html_theme_options = {'style_nav_header_background': 'white'}
 
 # Add any paths that contain custom themes here, relative to this directory.
 #html_theme_path = sphinx_bootstrap_theme.get_html_theme_path()
diff --git a/etc/requirements.txt b/etc/requirements.txt
index aecf5a3..5ba09a6 100644
--- a/etc/requirements.txt
+++ b/etc/requirements.txt
@@ -4,7 +4,7 @@
 docutils
 setuptools
 six
-sphinx_rtd_theme
+sphinx_rtd_theme>=0.4.3
 sphinxcontrib-blockdiag
 sphinxcontrib-needs>=0.2.3
 sphinxcontrib-nwdiag