diff --git a/anubis.yaml b/anubis.yaml
index 0ffcbf5..d682042 100644
--- a/anubis.yaml
+++ b/anubis.yaml
@@ -15,13 +15,13 @@ data:
         action: CHALLENGE
         challenge:
           algorithm: fast
-          difficulty: 5
+          difficulty: 6
       - name: non-browser-proof-of-work
         expression: "true"
         action: CHALLENGE
         challenge:
           algorithm: fast
-          difficulty: 5
+          difficulty: 6
 
     status_codes:
       CHALLENGE: 200