diff --git a/requirements_dev.txt b/requirements_dev.txt
index 92032521..ebf35c97 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,14 +3,14 @@ bump2version==0.5.10
 wheel==0.33.1
 watchdog==0.9.0
 flake8==3.7.7
-tox==3.7.0
-coverage==4.5.2
-Sphinx==1.8.4
+tox==3.9.0
+coverage==4.5.3
+Sphinx==2.0.1
 # only used for setup script
 # cryptography==1.0.1
 py==1.8.0
-pytest==4.3.0
-PyYAML==3.13
+pytest==4.4.1
+PyYAML==5.1
 prospector[with_everything]==1.1.6.2
 python-dateutil>=2.6.0
 requests>=2.18