diff --git a/requirements_dev.txt b/requirements_dev.txt
index 4ea07ea..02f2794 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,12 +1,12 @@
-pip==18.1
+pip==19.2.2
 bumpversion==0.5.3
-wheel==0.32.1
+wheel==0.33.4
 watchdog==0.9.0
-flake8==3.5.0
-tox==3.5.2
-coverage==4.5.1
-Sphinx==1.8.1
-twine==1.12.1
+flake8==3.7.8
+tox==3.13.2
+coverage==4.5.4
+Sphinx==2.1.2
+twine==1.13.0
 
-pytest==3.8.2
-pytest-runner==4.2
+pytest==5.0.1
+pytest-runner==5.1