diff --git a/requirements-dev.txt b/requirements-dev.txt
index 946d63039..f54b38a57 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,13 +2,13 @@
 -r requirements.txt
 -r requirements-plot.txt
 
+coveralls==1.8.1
 flake8==3.7.8
 flake8-type-annotations==0.1.0
 flake8-tidy-imports==2.0.0
+mypy==0.720
 pytest==5.0.1
-pytest-mock==1.10.4
 pytest-asyncio==0.10.0
 pytest-cov==2.7.1
+pytest-mock==1.10.4
 pytest-random-order==1.0.4
-coveralls==1.8.1
-mypy==0.720