diff --git a/seed/challenges/01-front-end-development-certification/front-end-development-certificate.json b/seed/challenges/01-front-end-development-certification/front-end-development-certificate.json
index b17d9df183..a5cfe98b26 100644
--- a/seed/challenges/01-front-end-development-certification/front-end-development-certificate.json
+++ b/seed/challenges/01-front-end-development-certification/front-end-development-certificate.json
@@ -43,8 +43,8 @@
             "/certificate/verify/front-end"
           ],
           "stepIndex": [
-            "1",
-            "2"
+            1,
+            2
           ]
         }
       ],
diff --git a/seed/challenges/02-data-visualization-certification/data-visualization-certificate.json b/seed/challenges/02-data-visualization-certification/data-visualization-certificate.json
index 26494ab79c..ea796699b8 100644
--- a/seed/challenges/02-data-visualization-certification/data-visualization-certificate.json
+++ b/seed/challenges/02-data-visualization-certification/data-visualization-certificate.json
@@ -43,8 +43,8 @@
             "/certificate/verify/data-visualization"
           ],
           "stepIndex": [
-            "1",
-            "2"
+            1,
+            2
           ]
         }
       ],
diff --git a/seed/challenges/03-back-end-development-certification/back-end-development-certificate.json b/seed/challenges/03-back-end-development-certification/back-end-development-certificate.json
index a840411b21..a3465d6805 100644
--- a/seed/challenges/03-back-end-development-certification/back-end-development-certificate.json
+++ b/seed/challenges/03-back-end-development-certification/back-end-development-certificate.json
@@ -43,8 +43,8 @@
             "/certificate/verify/back-end"
           ],
           "stepIndex": [
-            "1",
-            "2"
+            1,
+            2
           ]
         }
       ],