diff --git a/reference/catalog/product-variants_catalog.v3.yml b/reference/catalog/product-variants_catalog.v3.yml
index 7627a6dab..93d2a925e 100644
--- a/reference/catalog/product-variants_catalog.v3.yml
+++ b/reference/catalog/product-variants_catalog.v3.yml
@@ -1132,7 +1132,9 @@ paths:
                             upc:
                               type: string
                               description: The UPC code used in feeds for shopping comparison sites and external channel integrations.
-                              x-nullable: true
+                              nullable: false
+                              maxLength: 13
+                              minLength: 0
                             inventory_level:
                               type: integer
                               description: |- 
@@ -1347,7 +1349,9 @@ paths:
                       upc:
                         type: string
                         description: The UPC code used in feeds for shopping comparison sites and external channel integrations.
-                        x-nullable: true
+                        nullable: false
+                        maxLength: 13
+                        minLength: 0
                         example: "1234"
                       inventory_level:
                         type: integer
@@ -1472,7 +1476,9 @@ paths:
                             upc:
                               type: string
                               description: The UPC code used in feeds for shopping comparison sites and external channel integrations.
-                              x-nullable: true
+                              nullable: false
+                              maxLength: 13
+                              minLength: 0
                             inventory_level:
                               type: integer
                               description: |- 
@@ -1989,7 +1995,9 @@ components:
         upc:
           type: string
           description: The UPC code used in feeds for shopping comparison sites and external channel integrations.
-          nullable: true
+          nullable: false
+          maxLength: 13
+          minLength: 0
         image_url:
           type: string
           description: Publicly available image url
@@ -2019,9 +2027,13 @@ components:
         mpn:
           type: string
           description: The Manufacturer Part Number (MPN) for the variant.
+          nullable: false
         gtin:
           type: string
           example: '012345678905'
+          nullable: false
+          maxLength: 13
+          minLength: 0
       description: Common Variant properties.
       x-internal: false
       x-examples:
@@ -2186,7 +2198,9 @@ components:
             upc:
               type: string
               description: The UPC code used in feeds for shopping comparison sites and external channel integrations.
-              nullable: true
+              nullable: false
+              maxLength: 13
+              minLength: 0
             inventory_level:
               type: integer
               description: |- 
@@ -2217,10 +2231,14 @@ components:
               type: string
               description: Global Trade Item Number
               example: '012345678905'
+              nullable: false
+              maxLength: 13
+              minLength: 0
             mpn:
               type: string
               description: Manufacturer Part Number
               example: HV-HM02
+              nullable: false
           description: Common Variant properties.
         - type: object
           properties:
diff --git a/reference/catalog/products_catalog.v3.yml b/reference/catalog/products_catalog.v3.yml
index ccd3c7a60..70556add6 100644
--- a/reference/catalog/products_catalog.v3.yml
+++ b/reference/catalog/products_catalog.v3.yml
@@ -5367,7 +5367,9 @@ components:
         upc:
           type: string
           description: The UPC code used in feeds for shopping comparison sites and external channel integrations.
-          nullable: true
+          nullable: false
+          maxLength: 13
+          minLength: 0
         inventory_level:
           type: integer
           description: |- 
@@ -5394,9 +5396,13 @@ components:
         mpn:
           type: string
           description: The Manufacturer Part Number (MPN) for the variant.
+          nullable: false
         gtin:
           type: string
           example: '012345678905'
+          nullable: false
+          maxLength: 13
+          minLength: 0
       description: Common Variant properties.
       x-internal: false
       x-examples:
@@ -5559,7 +5565,9 @@ components:
         upc:
           type: string
           description: The UPC code used in feeds for shopping comparison sites and external channel integrations.
-          nullable: true
+          nullable: false
+          maxLength: 13
+          minLength: 0
         inventory_level:
           type: integer
           description: |- 
@@ -7052,8 +7060,9 @@ components:
             The layout template file used to render this product category. This field is writable only for stores with a Blueprint theme applied. For stores with a Stencil theme applied, see [Custom Template Associations](/docs/rest-content/custom-template-associations).
         upc:
           type: string
-          maxLength: 32
+          maxLength: 13
           minLength: 0
+          nullable: false
           description: |
             The product UPC code, which is used in feeds for shopping comparison sites and external channel integrations.
         search_keywords:
@@ -7218,9 +7227,13 @@ components:
         gtin:
           type: string
           description: Global Trade Item Number
+          nullable: false
+          maxLength: 13
+          minLength: 0
         mpn:
           type: string
           description: Manufacturer Part Number
+          nullable: false
         date_last_imported:
           type: string
           description: the date when the Product had been imported
@@ -7544,8 +7557,9 @@ components:
             The layout template file used to render this product category. This field is writable only for stores with a Blueprint theme applied. For stores with a Stencil theme applied, see [Custom Template Associations](/docs/rest-content/custom-template-associations).
         upc:
           type: string
-          maxLength: 32
+          maxLength: 13
           minLength: 0
+          nullable: false
           description: |
             The product UPC code, which is used in feeds for shopping comparison sites and external channel integrations.
         search_keywords:
@@ -7710,9 +7724,13 @@ components:
         gtin:
           type: string
           description: Global Trade Item Number
+          nullable: false
+          maxLength: 13
+          minLength: 0
         mpn:
           type: string
           description: Manufacturer Part Number
+          nullable: false
         date_last_imported:
           type: string
           description: the date when the Product had been imported