diff --git a/setup.cfg b/setup.cfg
index bef3558a5..d08d9968c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -73,7 +73,7 @@ dev =
     nbsphinx
     pycodestyle
     pytest-cov<2.6.0
-    pytest>=3.2
+    pytest>=3.2,<4.6
     sphinx
     sphinx_rtd_theme>=0.4.3
     nbsphinx
diff --git a/tox.ini b/tox.ini
index 697314525..f09c722ce 100644
--- a/tox.ini
+++ b/tox.ini
@@ -27,6 +27,7 @@ usedevelop = false
 deps =
     pytest-cov
     ipywidgets
+    pytest<4.6
 skip_install = false
 commands =
     {posargs:pytest --cov --cov-report=term-missing -vv src/poliastro/tests}