diff --git a/config.json b/config.json
index 9dedc8f3ff..05dfc855ea 100644
--- a/config.json
+++ b/config.json
@@ -432,7 +432,10 @@
         ],
         "prerequisites": [
           "numbers",
-          "arithmetic-operators"
+          "arithmetic-operators",
+          "strings",
+          "objects",
+          "functions"
         ]
       }
     ],