diff --git a/tox.ini b/tox.ini
index 9fcd038bd..938ac3ab2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,7 +24,6 @@ deps =
     hypothesis-pytest==0.17.0
     coverage==3.7.1
     pytest-cov==2.1.0
-    cov-core==1.15.0
     beautifulsoup4==4.4.0
 commands =
     {envpython} scripts/link_pyqt.py --tox {envdir}