diff --git a/requirements_dev.txt b/requirements_dev.txt
index bfd1a25..b4f9240 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,7 +8,7 @@ coverage==4.5.1
 Sphinx==1.8.2
 cryptography==2.4.1
 PyYAML==3.12
-pytest==3.8.2
+pytest==4.0.0
 pytest-runner==4.2
 vcrpy==1.13.0
 twine==1.12.1