diff --git a/requirements-dev.txt b/requirements-dev.txt
index 436a7a51b..c5f055a26 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,8 +2,9 @@
 mock
 nose
 black; python_version >= '3.6'
+regex==2019.11.1; python_version >= '3.6'   # Needed for black
 sure==1.4.11
-coverage
+coverage==4.5.4
 flake8==3.7.8
 freezegun
 flask