diff --git a/cluster/juju/charms/trusty/kubernetes-master/requirements.txt b/cluster/juju/charms/trusty/kubernetes-master/requirements.txt
index 0cd4a6a2d650d..d1755bf732366 100644
--- a/cluster/juju/charms/trusty/kubernetes-master/requirements.txt
+++ b/cluster/juju/charms/trusty/kubernetes-master/requirements.txt
@@ -3,3 +3,5 @@ pytest
 bundletester
 path.py
 charmhelpers
+
+requests>=2.20 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file