diff --git a/config.json b/config.json
index ef2ac13..30b9935 100644
--- a/config.json
+++ b/config.json
@@ -132,7 +132,7 @@
           "strings"
         ],
         "prerequisites": [],
-        "difficulty": 0
+        "difficulty": 1
       },
       {
         "slug": "two-fer",