Manual update of pip requirements

Change-Id: I82e13ddf6c5df57387e9aeb4b35f96e79dd0e9ea
Signed-off-by: beierlm <mark.beierl@canonical.com>
diff --git a/tox.ini b/tox.ini
index 5c9b9a9..8997616 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
         [