diff --git a/requirements_dev.txt b/requirements_dev.txt
index e1dae6c..6ca6fe2 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,10 +2,10 @@ pip==8.1.2
 bumpversion==0.5.3
 wheel==0.29.0
 watchdog==0.8.3
-flake8==2.6.0
+flake8==3.0.4
 tox==2.3.1
-coverage==4.1
-Sphinx==1.4.4
+coverage==4.2
+Sphinx==1.4.5
 cryptography==1.4
 PyYAML==3.11
-pytest==2.9.2
+pytest==3.0.1