diff --git a/requirements_dev.txt b/requirements_dev.txt
index 53a3f2f..4ec627b 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,9 +1,9 @@
-wheel==0.35.1
-flake8==3.8.4
-tox==3.20.1
-coverage==5.3
-coveralls==2.1.2
-pytest==6.1.2
-pytest-cov==2.10.1
-pytest-runner==5.2
-twine==3.2.0
+wheel==0.36.2
+flake8==3.9.0
+tox==3.23.0
+coverage==5.5
+coveralls==3.0.1
+pytest==6.2.2
+pytest-cov==2.11.1
+pytest-runner==5.3.0
+twine==3.4.1