diff --git a/requirements.txt b/requirements.txt
index 5a217ba..e480d4f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ Flask==1.1.1
 marshmallow==2.15.3
 marshmallow-annotations==2.4.0
 mypy==0.720
-pytest
+pytest>=4.6
 pytest-cov
 pytest-mock
 mock