--- a/dev-requirements.txt	Sun Apr 12 23:56:27 2020 +0800
+++ b/dev-requirements.txt	Mon Apr 13 00:11:33 2020 +0800
@@ -1,3 +1,3 @@
-mock==2.0.0
-pytest==3.6.0
-pytest-cov==2.5.1
+mock==3.0.5
+pytest==4.6.9
+pytest-cov==2.8.1