diff --git a/tox.ini b/tox.ini
index 64f77d7..1b65e74 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ envlist = format,mypy,py37,py38,pep8,setuppy,manifest
 
 [testenv]
 deps =
-    pytest
+    pytest<5.4
     pytest-cov
     pytest-sugar
     pytest-trio