1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 599a534..1da88f3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ log_format = %(created)f %(filename)-23s %(threadName)s %(message)s
 
 [testenv]
 deps =
-    pytest
+    pytest<4.0
     pytest-cov
     py{27,34,35,36,py}: pylint
     py{27,34,35,36,py}: pytest-pylint