diff --git a/requirements_dev.txt b/requirements_dev.txt
index 5a98719..04c2678 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,7 +8,7 @@ coverage==4.5.1
 Sphinx==1.7.2
 cryptography==2.1.4
 PyYAML==3.12
-pytest==3.4.0
+pytest==3.5.0
 pytest-runner==4.0
 docutils==0.14
 numpy==1.14.0