diff --git a/tests/requirements.txt b/tests/requirements.txt
index 327f563a..562be4b7 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,5 +1,6 @@
 psutil==5.4.8
 coverage==4.5.1
+coveralls==1.5.1
 Django==1.6.11  # Last version supporting 2.6.
 mock==2.0.0
 pytz==2018.5