diff --git a/requirements-dev.txt b/requirements-dev.txt
index d4e5654..6adfb40 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,4 +4,4 @@ pep8-naming==0.7.0
 pep8==1.7.1
 phulpy==1.0.3
 pytest-cov==2.5.1
-pytest==3.6.3
+pytest==9.0.3