diff --git a/tox.ini b/tox.ini
index 21c559d..8f9952c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -83,7 +83,7 @@
 
 #######################################################################################
 [testenv:pip-compile]
-deps =  pip-tools==6.6.2
+deps =  pip-tools==6.13.0
 skip_install = true
 allowlist_externals = bash
         [
@@ -91,7 +91,7 @@
         - bash -c "for file in requirements*.in ; do \
         UNSAFE="" ; \
         if [[ $file =~ 'dist' ]] ; then UNSAFE='--allow-unsafe' ; fi ; \
-        pip-compile -rU --no-header $UNSAFE $file ;\
+        pip-compile --resolver=backtracking -rU --no-header $UNSAFE $file ;\
         out=`echo $file | sed 's/.in/.txt/'` ; \
         sed -i -e '1 e head -16 tox.ini' $out ;\
         done"