diff --git a/requirements_dev.txt b/requirements_dev.txt
index 801640b..d7bc00c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,9 +1,9 @@
-wheel==0.34.2
-flake8==3.8.2
-tox==3.15.1
-coverage==5.1
-coveralls==2.0.0
-pytest==5.4.2
-pytest-cov==2.9.0
+wheel==0.35.1
+flake8==3.8.3
+tox==3.20.0
+coverage==5.2.1
+coveralls==2.1.2
+pytest==6.0.1
+pytest-cov==2.10.1
 pytest-runner==5.2
-twine==3.1.1
+twine==3.2.0