diff --git a/requirements/devel.txt b/requirements/devel.txt
index 1e7c29bc..4a0577f3 100644
--- a/requirements/devel.txt
+++ b/requirements/devel.txt
@@ -4,9 +4,6 @@ appdirs
 setuptools
 wheel
 twine
-sphinx==2.2.0
-beautifulsoup4
-doc2dash
 requests
 requests[security]
 cython
@@ -14,3 +11,8 @@ pytest
 pytest-xdist
 pytest-forked
 pytest-timeout
+
+sphinx==2.2.0 ; python_version >= '3.0'
+sphinx==1.8.5 ; python_version < '3.0'
+doc2dash==2.3.0
+beautifulsoup4