diff --git a/requirements/tests.txt b/requirements/tests.txt
index 62891aa..ac1658a 100644
--- a/requirements/tests.txt
+++ b/requirements/tests.txt
@@ -1,5 +1,5 @@
 # latest version to validate behavior on pure python env
-pytest==3.5.0
-pytest-xdist==1.22.2  # for --boxed
-hypothesis==3.56.3
-numpy==1.14.2
+pytest==4.1.0
+pytest-xdist==1.25.0  # for --boxed
+hypothesis==3.86.6
+numpy==1.15.4