diff --git a/requirements.txt b/requirements.txt
index 3240c3d51..a505dded1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,6 +9,6 @@ ujson>=1.35
 dill>=0.2,<0.3
 regex==2018.01.10
 requests>=2.13.0,<3.0.0
-pytest>=4.0.0,<5.0.0
+pytest>=4.0.0,<4.1.0
 mock>=2.0.0,<3.0.0
 pathlib==1.0.1; python_version < "3.4"