diff --git a/requirements_dev.txt b/requirements_dev.txt
index fe30227..a909c1d 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,14 +1,14 @@
-pip==19.3.1
+pip==20.2.3
 bumpversion==0.6.0
-wheel==0.34.2
+wheel==0.35.1
 watchdog==0.10.3
-flake8==3.8.2
-tox==3.15.0
-coverage==5.0.4
-Sphinx==3.0.4
+flake8==3.8.4
+tox==3.20.1
+coverage==5.3
+Sphinx==3.2.1
 cryptography==2.8
 PyYAML==5.3.1
 pytest==5.3.5
 pytest-runner==5.2
 vcrpy==2.1.1
-twine==3.1.1
+twine==3.2.0