1 files changed, 1 insertions, 1 deletions
diff --git a/setup.py b/setup.py
index 758a2259b..afddbda35 100644
--- a/setup.py
+++ b/setup.py
@@ -44,7 +44,7 @@ tests_require = [
 
 
 docs_extras = [
-    'Sphinx == 1.8.5',  # Current version for Read the Docs
+    'Sphinx >= 1.8.1',  # Unicode characters in tree diagrams
     'docutils',
     'pylons-sphinx-themes >= 1.0.8',  # Ethical Ads
     'pylons_sphinx_latesturl',