PyYAML fix

Change-Id: Ic0e36a393bcd707ec9cbb90136ef037e3d9cd9ea
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>
diff --git a/requirements.in b/requirements.in
index 7565f29..c7c56de 100644
--- a/requirements.in
+++ b/requirements.in
@@ -20,6 +20,6 @@
 prettytable
 pycurl
 python-magic
-pyyaml==5.3.1
+pyyaml>6
 requests
 verboselogs