diff --git a/setup.py b/setup.py
index 00066f957..c6cafbdda 100644
--- a/setup.py
+++ b/setup.py
@@ -64,7 +64,7 @@ setup(
         "certifi>=2015.11.20.1",  # no semver here - this should always be on the last release!
         "configargparse>=0.10, <0.12",
         "construct>=2.5.2, <2.6",
-        "cryptography>=1.3, <1.6",
+        "cryptography>=1.3, <1.7",
         "cssutils>=1.0.1, <1.1",
         "Flask>=0.10.1, <0.12",
         "h2>=2.5.0, <3",