Manual update of pip requirements

Change-Id: I2b8dd60bd61b579768f80b57303ff874a0d2f42c
Signed-off-by: beierlm <mark.beierl@canonical.com>
diff --git a/tox.ini b/tox.ini
index bf0cdb9..232c689 100644
--- a/tox.ini
+++ b/tox.ini
@@ -82,7 +82,7 @@
 
 #######################################################################################
 [testenv:pip-compile]
-deps =  pip-tools==6.4.0
+deps =  pip-tools==6.6.2
 skip_install = true
 whitelist_externals = bash
         [