diff --git a/lower-constraints.txt b/lower-constraints.txt
index fa016b5f..e1eff619 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -6,6 +6,7 @@ coverage==4.0
 debtcollector==1.2.0
 docutils==0.11
 dulwich==0.15.0
+enum34==1.0.4;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
 extras==1.0.0
 fixtures==3.0.0
 flake8==2.5.5
@@ -41,7 +42,7 @@ rfc3986==0.3.1
 six==1.10.0
 smmap==0.9.0
 snowballstemmer==1.2.1
-Sphinx==1.6.5
+Sphinx==1.6.2
 sphinxcontrib-websupport==1.0.1
 stevedore==1.20.0
 testrepository==0.0.18