diff --git a/requirements_dev.txt b/requirements_dev.txt
index d3d575c..fd4e7e2 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,7 +8,7 @@ Sphinx==1.7.5
 coverage==4.5.1
 cryptography==2.2.2
 PyYAML==3.12
-pytest==3.6.0
+pytest==4.3.1
 six==1.11.0
 enum34==1.1.6
 nltk==3.3