diff --git a/readthedocs/doc_builder/python_environments.py b/readthedocs/doc_builder/python_environments.py
index 8b54278956f..96190a47919 100644
--- a/readthedocs/doc_builder/python_environments.py
+++ b/readthedocs/doc_builder/python_environments.py
@@ -245,7 +245,7 @@ def install_core_requirements(self):
                     positive='sphinx<2',
                     negative='sphinx==1.7.4',
                 ),
-                'sphinx-rtd-theme<0.4',
+                'sphinx-rtd-theme<0.5',
                 'readthedocs-sphinx-ext<0.6'
             ])
 
diff --git a/readthedocs/rtd_tests/tests/test_doc_building.py b/readthedocs/rtd_tests/tests/test_doc_building.py
index de5c7b92f5f..27664688262 100644
--- a/readthedocs/rtd_tests/tests/test_doc_building.py
+++ b/readthedocs/rtd_tests/tests/test_doc_building.py
@@ -1153,7 +1153,7 @@ def test_install_core_requirements_sphinx(self):
             'commonmark==0.5.4',
             'recommonmark==0.4.0',
             'sphinx==1.7.4',
-            'sphinx-rtd-theme<0.4',
+            'sphinx-rtd-theme<0.5',
             'readthedocs-sphinx-ext<0.6',
         ]
         requirements = self.base_requirements + requirements_sphinx