diff --git a/requires/installation.txt b/requires/installation.txt
index ef1e120..293b5b2 100644
--- a/requires/installation.txt
+++ b/requires/installation.txt
@@ -1 +1 @@
-tornado>=4.0,<4.5
+tornado>=5
diff --git a/requires/testing.txt b/requires/testing.txt
index fd00fa2..1ead251 100644
--- a/requires/testing.txt
+++ b/requires/testing.txt
@@ -1,2 +1 @@
 nose>=1.3,<2
-tornado>=4.2,<4.3