diff --git a/setup.py b/setup.py
index ca3c6fe..fbfd1ce 100644
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,7 @@
             'pylint-quotes==0.2.*',
             'pylint>=2.15,<3.1',
             'pytest-cov==4.0.*',
-            'pytest-instafail==0.4.*',
+            'pytest-instafail>=0.4,<0.6',
             'pytest-isort==3.1.*',
             # 'pytest-pylint==0.19.*',  #: https://github.com/carsongee/pytest-pylint/issues/180
             'pytest-watch==4.2.*',