diff --git a/facsimile/requirements-test.txt b/facsimile/requirements-test.txt
index e1b48db..349e2dc 100644
--- a/facsimile/requirements-test.txt
+++ b/facsimile/requirements-test.txt
@@ -1,5 +1,5 @@
 codecov>=2.0.5
 coverage>=4.1
-pytest>=2.9.2,<4
-pytest-cov>=2.3,<3
-tox>=2.3.1,<3
+pytest>=2.9.2, <4
+pytest-cov>=2.3, <3
+tox>=2.3.1, <4