diff --git a/dev-requirements.txt b/dev-requirements.txt
index 511c1270..ca483e47 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,6 +1,6 @@
-coverage==4.0.3
+coverage==4.2
 pep8==1.7.0
-pyflakes==1.1.0
+pyflakes==1.2.3
 mccabe==0.4.0
 flake8==2.5.4
 piprot==0.9.6