diff --git a/test-requirements.txt b/test-requirements.txt
index 70f8ceb..5400200 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -6,9 +6,9 @@
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 flake8-docstrings==0.2.1.post1 # MIT
 
-coverage>=4.0 # Apache-2.0
+coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
-sphinx>=1.5.1 # BSD
+sphinx!=1.6.1,>=1.5.1 # BSD
 testrepository>=0.0.18 # Apache-2.0/BSD
 testresources>=0.2.4 # Apache-2.0/BSD
 testtools>=1.4.0 # MIT