diff --git a/requirements_dev.txt b/requirements_dev.txt
index 0bec9a4..680243f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,10 +1,10 @@
 bumpversion==0.5.3
-wheel==0.30.0
+wheel==0.31.0
 watchdog==0.8.3
 flake8==3.5.0
 tox==2.9.1
 coverage==4.5.1
 Sphinx==1.7.2
 sphinx-rtd-theme==0.2.4
-cryptography==2.2.1
+cryptography==2.2.2
 PyYAML==3.12