diff --git a/requirements_dev.txt b/requirements_dev.txt
index 0c47b69..a87eb7e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,13 +1,13 @@
 bump2version==0.5.10
 coverage==4.5.3
 flake8==3.7.7
-mock==2.0.0
-pip==19.1
-pytest==4.4.1
-pytest-runner==4.4
+mock==3.0.5
+pip==19.1.1
+pytest==4.5.0
+pytest-runner==5.1
 six==1.12.0
 Sphinx==1.8.5 # pyup: <2.0 # for Python 2.7 and 3.4 support
-tox==3.9.0
+tox==3.12.1
 twine==1.13.0
 watchdog==0.9.0
-wheel==0.33.1
+wheel==0.33.4