diff --git a/requirements_dev.txt b/requirements_dev.txt
index 2564ada..82bd631 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,11 +2,11 @@ pip==8.1.2
 bumpversion==0.5.3
 wheel==0.29.0
 watchdog==0.8.3
-flake8==2.6.0
-freezegun
+flake8==3.0.4
+freezegun==0.3.7
 tox==2.3.1
-coverage==4.1
-Sphinx==1.4.4
-cryptography==1.4
-PyYAML==3.11
-pytest
+coverage==4.2
+Sphinx==1.4.6
+cryptography==1.5.2
+PyYAML==3.12
+pytest==3.0.2