diff --git a/lower-constraints.txt b/lower-constraints.txt
index a15cd07..be8eef3 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -81,7 +81,7 @@ python-neutronclient==6.7.0
 python-novaclient==10.1.0
 python-openstackclient==3.14.0
 python-swiftclient==3.5.0
-python-zunclient==1.4.0
+python-zunclient==3.5.0
 pytz==2018.3
 PyYAML==3.12
 rcssmin==1.0.6
diff --git a/requirements.txt b/requirements.txt
index c8957b5..e45738b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,6 +8,6 @@
 #
 # PBR should always appear first
 pbr>=3.1.1 # Apache-2.0
-python-zunclient>=1.4.0 # Apache-2.0
+python-zunclient>=3.5.0 # Apache-2.0
 
 horizon>=15.0.0.0b1 # Apache-2.0