diff --git a/requirements_dev.txt b/requirements_dev.txt
index 423a42d..78a9966 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@
 pytest==4.4.0
 pytest-runner==4.4
 six==1.12.0
-Sphinx==2.0.0
+Sphinx==1.8.5 # pyup: <2.0 # for Python 2.7 and 3.4 support
 tox==3.8.4
 twine==1.13.0
 watchdog==0.9.0