diff --git a/readthedocs/doc_builder/python_environments.py b/readthedocs/doc_builder/python_environments.py
index 6da737518..eb1163891 100644
--- a/readthedocs/doc_builder/python_environments.py
+++ b/readthedocs/doc_builder/python_environments.py
@@ -97,7 +97,7 @@ class Virtualenv(PythonEnvironment):
 
     def install_core_requirements(self):
         requirements = [
-            'sphinx==1.3.4',
+            'sphinx==1.3.5',
             'Pygments==2.0.2',
             'setuptools==18.6.1',
             'docutils==0.12',
@@ -187,7 +187,7 @@ class Conda(PythonEnvironment):
 
         # Use conda for requirements it packages
         requirements = [
-            'sphinx==1.3.1',
+            'sphinx==1.3.5',
             'Pygments==2.0.2',
             'docutils==0.12',
             'mock',
diff --git a/requirements/pip.txt b/requirements/pip.txt
index bbfe3b8b8..7c81afb62 100644
--- a/requirements/pip.txt
+++ b/requirements/pip.txt
@@ -2,7 +2,7 @@
 pip==7.1.0
 virtualenv==13.1.0
 docutils==0.11
-Sphinx==1.3.4
+Sphinx==1.3.5
 Pygments==2.0.2
 mkdocs==0.14.0