diff --git a/requirements_dev.txt b/requirements_dev.txt
index 630aebc..3ce37cd 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ coverage==4.5.1
 cryptography==2.3.1
 flake8==3.5.0
 pip==18.0
-pytest==3.7.4
+pytest==3.9.1
 pytest-runner==4.2
 pytz==2018.5
 PyYAML==3.13