diff --git a/requirements_dev.txt b/requirements_dev.txt
index d0a8531..02fcc2a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,9 +3,9 @@ bumpversion==0.5.3
 wheel==0.31.1
 watchdog==0.8.3
 flake8==3.5.0
-tox==3.0.0
+tox==3.1.2
 coverage==4.5.1
-Sphinx==1.7.5
+Sphinx==1.7.6
 cryptography==2.3
 PyYAML==3.12
 pytest==3.6.3