diff --git a/tox.ini b/tox.ini
index c0f021d7044..e4fff82fdd4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -46,7 +46,7 @@ deps =
     oldest: qtconsole==4.7.2
     oldest: pygments==2.8.0
     oldest: pip==18.0
-    oldest: numpy==1.19.0
+    oldest: numpy==1.17.0
     oldest: scipy==1.2.0
     oldest: scikit-learn==0.23.1
     oldest: bottleneck==1.3.2