diff --git a/test-requirements.txt b/test-requirements.txt
index 445b96d..42c5681 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 hacking<0.10,>=0.9.2
 
-coverage>=3.6 # Apache-2.0
+coverage>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 python-subunit>=0.0.18 # Apache-2.0/BSD
 sphinx!=1.3b1,<1.4,>=1.2.1 # BSD