diff --git a/test/runner/requirements/constraints.txt b/test/runner/requirements/constraints.txt
index 720d4a4bd99..686b5e1305b 100644
--- a/test/runner/requirements/constraints.txt
+++ b/test/runner/requirements/constraints.txt
@@ -1,2 +1,2 @@
-coverage >= 4.2, < 4.3.2
+coverage >= 4.2, != 4.3.2 # features in 4.2+ required, avoid known bug in 4.3.2 on python 2.6
 pywinrm >= 0.2.1 # 0.1.1 required, but 0.2.1 provides better performance