PyYAML fix

Change-Id: Icd71a982131353a03fa745ff7616ad657173e657
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>
diff --git a/requirements.txt b/requirements.txt
index 6907cea..db77ca5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,5 +20,5 @@
     # via jinja2
 pymzn==0.18.3
     # via -r requirements.in
-pyyaml==5.3.1
+pyyaml==6.0.1
     # via -r requirements.in